Consider the following chromosomes and if they are affected by hemophilia.
X = unaffected X chromosome, x = X chromosome affected by hemophilia, and Y = Y chromosome.
If an Xx female and XY male have children, what fraction of their offspring will have an affected chromosome, and what fraction is likely to be affected by hemophilia?
(1 point)
A. 1/4 and 1/2
B. 1/2 and 1/4
C. 1/2 and 1/3
D. 1/4 and 1/4
I've been stuck on this question for a while, may someone please assist?
Answers
Answer:
B. 1/2 and 1/4
Explanation:
Hemophilia is a rare disease that has to do with the inability for blood to clot. It is inherited on the X chromosome, hence, it is said to be X-linked. It is usually passed from mother to son. According to this question;
X - unaffected X chromosome
x = X chromosome affected by hemophilia
Y = Y chromosome
Therefore, in a cross between a Xx female (carrier) and a XY male (unaffected), the following chromosomes will be present in the gametes produced by each parent:
Xx- X and x gametes
XY- X and Y gametes
Using these gametes in a punnet square (see attached image), offsprings with genotypes: XX, Xx, XY and xY will be possibly produced.
XX (1) - unaffected female
Xx (1) - unaffected but carrier female
XY (1) - unaffected male
xY (1) - affected male (have hemophilia)
Based on the questions;
- 2 out of the possible 4 children will have the affected chromosomes i.e. both xY son and Xx daughter have the affected (x) chromosome. Hence, the fraction is 1/2
- 1 out of the 4 possible children is affected by hemophilia, which is the xY son. Hence, the fraction is 1/4.
Related Questions
You are the lucky student of a wacky professor who develops a time machine. He asks if you will test it with him. You get in and there is an immediate glitch–the date readout fails so that when you land you are not sure what era you are in. As your time machine lands, you see an unusual landscape before you. As you open the door you realize you cannot breathe. You quickly shut the door, realizing you are in the _____.
1) Archaean eon
2) Cambrian period
3) Cenozoic era
4) Mesozoic era
Answers
Answer: Option 1 is the correct answer
Archaean eon
Explanation:
You are in the Archean Eon era because the it was early in the Archean that life first appeared on Earth. The most two earlier of the formal divisions of Precambrian time (about 4.6 billion to 541 million years ago) and the period when life first formed on Earth It began about 4 billion years ago with the formation of Earth’s crust and enlongated to the begining of the Proterozoic Eon 2.5 billion years ago; the latter is the second formal division of Precambrian time.
In the Archean eon there are unsual landscapes no rocks are preserved from this stage. The earliest terrestrial materials are not rocks but minerals.
Throughout the Archean, oceanic and island arc crust was produced semi-half way.
You cannot breathe because there was no oxygen on the Earth. Oxygen was only present in compounds such as water and chemical reactions change to carbon containing molecules that form simple living cells that does not require oxygen.
The following events are part of a negative-feedback mechanism. I. blood pressure increase II. receptors detect a low blood pressure III. control center compares actual pressure with the set point IV. the heart beats faster Choose the arrangement that lists the event in the order they occur.
Answers
Answer:
II, III, IV, I
Explanation:
Blood pressure regulation is an example of negative feedback mechanism. When the blood pressure is low, sensor in the blood vessels called baroreceptors detect this and send a signal to the control center which is the hypothalamus.
The hypothalamus compares the current blood pressure with the normal and proceeds to send signals to the heart, as well as blood vessels and kidneys. The heart begins to beat faster, thereby increasing the heart rate and a a result, blood pressure goes back up to normal.
WILL GIVE BRAINLIEST AND POINTS!!!!!!! How long can we survive on each planet of the solar system without a spacesuit?
Answers
Answer:
about 80 days
Explanation:
the time period of survival is roughly a second, even though the gravity force is equal to that of Earth (the more you know!) Without holding our breaths, or donning any kind of spacesuit, we can survive for about 80 years
identiying Parts of Spheres Use the drop-down menus to identify the spheres to which each part belongs.
A lake is part of the ___
Water vapor in the air is part of the___
Glacier and iceburgs are part of the___
The rocky mountains are part of the___
A deer is part of the____
Answers
Answer:
Answer is
A lake is part of the hydrosphere.
Water vapor in the air is part of the atmosphere.
Glacier and icebergs are part of the cryosphere.
The Rocky Mountains are part of the geosphere.
A deer is part of the biosphere.
12. What group of organisms are most in danger of extinction?
those with small populations
both a and b
those with large populations that breed quickly
those that migrate or need special habitats
Answers
Answer:
Both A and B
Explanation:
Which option identifies ways that people positively affect Earth’s resources?
Answers
Answer:
c is the correct answer on EDGE2020
There are many ways by which humans can positively impact Earth's resources. These include reforestation, reducing pollution, protection of endangered species, and mindful use of water and attempts to replenish the water bodies, etc.
What are the earth's resources?The resources present on earth which were not formed due to any kind of human intervention are called earth's resources or earth's natural resources. There are various natural resources found on earth.
Energy resources like petroleum and natural gas, metallic resources like iron, copper, and gold, and nonmetallic resources like granite, sandstone, etc are some of the examples of various resources found on earth.
However, due to the rise in consumerism, these resources are being overexploited by humans which have resulted in their depletion.
But, the awareness of this is spreading fast and humans have adopted various measures to prevent negative impacts and induce positive impacts on the resources of the earth.
Therefore, humans can have a positive impact on Earth's resources.
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If a hermit crab leaves its shell, is the shell biotic?
Answers
Answer:
no
Explanation:
explain the reason for the variation in production by referring to the possible causes for variation in a population
Answers
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
which class question is this?
what is the answer to 9k=27
Answers
Answer:
K=3
Explanation:
We divide both sides by 9 which is 9k/9=27/9 then cancel 9 by 9 and by 9 once by 9 thrice.
Which of the following is not a function of the cell membrane? A. Keeping all the parts of a cell inside B. Helping a cell to alter its shape C. Allow prokaryotes to use cell division D. A place for cellular reactions to take place
Answers
Answer:
D. A place for cellular reactions to take place
Explanation:
the cell membrane perfomes divers functions ranging from the Keeping of all the parts of a cell inside, helping cell to alter its shape, allowing prokaryotes to use cell division. Most of the cell reactions happens in the Mitochondrion, not the CELL MEMBRANE
A place for cellular reactions to take place is not true about cell membrane .
What are the function of cell membrane ?Cell membrane forms barrier keeping the constituents of the cell in and unwanted substances out and to be a gate allowing transport into the cell of essential nutrients and movement from the cell of waste products.
What is cell membrane?The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment.
Hence, D is correct option
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Define symbol and valency?
Answers
they are blur
but hope you will under stand and pls pls markas brainliest ans
In part A, you analyzed genes that contribute to two diseases. (cystic fibrosis and muscular dystrophy) How can scientists use this information to develop new treatments for these diseases? Based on your findings, do you think that scientists will need to develop multiple treatments to control symptoms of these diseases? Explain your reasoning.
Answers
Answer:
By designing suitable gene therapies in order to restore target gene expression.
Explanation:
Cystic fibrosis and muscular dystrophy are inherited genetic disorders associated with serious health problems. Cystic fibrosis is caused by mutations in the gene that encodes for the cystic fibrosis transmembrane conductance regulator (CFTR) protein, and it is a condition associated with abnormal production of sticky mucus that leads to problems in the lungs and the digestive systems. On the other hand, muscular dystrophy is produced by mutations in genes localized on the X chromosome such as, for example, the gene 'dystrophin'. Gene therapy is an experimental approach used to compensate abnormal gene function by introducing exogenous genetic material and thus restore their altered protein products. Consequently, personalized gene therapies can be useful to treat inherited disorders such as cystic fibrosis and muscular dystrophy.
the size of ribosome of _________cell is smaller than ribosome of plant cell. A. Animal cell B. fungal cell C.Bacterial cell D. Protists cell
Answers
Answer:
the size of ribosome of (animal cell )is smaller than ribosome of plant cell
Answer:
Animal cell is smaller than ribosome of plant cell
Explanation:
What is the Defenition of Metabolism?
a
When offspring change and develop over millions of years
b
When living things change over time.
c
The flow of chemical energy in an organism.
d
When an organism produces an offspring
Answers
Answer:
c.
Explanation:
metabolism is defined as the flow of chemical energy in an organism.
Over the period of a few days, a hospital receives an overwhelming increase in the number of patients with food poisoning. How would a scientist respond to this increase in sick patients? A. by examining the type and source of foods each patient ate and identifying patterns of overlap within the foods consumed B. by giving the patients vitamin injections and prescribing a medication to calm their stomach and bowel symptoms C. by recording the patients' symptoms in their medical records and advising them to get rest and drink fluids D.by providing kind words, nurturing, and emotional support to the patients and asking them about their feelings
Answers
Answer:
A. By examining the type and source of foods each patient ate and identifying patterns of overlap within the foods consume.
Explanation:
I believe a medical professional would be the one to prescribe patients with any sort of medicine they needed, whereas the scientist would be investigated what caused the food poison and running tests to help find out what happened.
Answer:
A. By examining the type and source of foods each patient ate and identifying patterns of overlap within the foods consume.
Explanation:
Explain how Darwin’s theory of evolution by natural selection may have led to all giraffes having long necks.
Answers
Answer:
Because this individual had a longer neck, it was able to reach food sources that other animals couldn't...
Match each scientist to the observation she is most likely to make.
meteorologist
?
The average daily
temperature of the ocean
at the North Pole has
Increased during the past
50 years.
hydrologist
2
Last year, the state of
Florida experienced an
unusually long and active
hurricane season.
geologist
?
The elevation of a
mountain range has
increased 1cm over the
last 50 years.
Earth's rotation was
affected by a massive
underwater earthauake
astronomer
2.
Answers
The scientist and the observation to be made are matched below:
The meteorologist - Last year, the state of Florida experienced an unusually long and active hurricane season.The hydrologist- The average daily temperature of the ocean at the North Pole has Increased during the past 50 years.The geologist- The elevation of a mountain range has increased 1cm over the last 50 years.The astronomer- Earth's rotation was affected by a massive underwater earthquake.Astronomers are known to observe planet.
The Meteorologist are known for rainfall observation.
Hydrologist- often observe rivers, water bodies e.g. Mississippi River
Geologist - deals with rocks e.g Mountains observation.
Climate change often cause a shifts in temperatures and weather patterns.
The climate change is largely due to human activity, such as burning fossil fuels, like natural gas, oil, and coal etc.
Conclusively, various types of profession exist in the environmental discipline and each has specific roles to play.
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Well this isn’t biology this is earth science but it doesn’t have the option.... 1. What geologic processes must have occurred for fossil ammonites (relatives to the nautilus that dominated oceans hundreds of years ago) to now be found in rocks at the highest mountains on Earth??
2. What would our planet look like if it contained no radioactive isotopes within it? What would it look like if radioactivity were producing twice as much heat within Earth’s interior?
Answers
The answers are that the geological process responsible for fossils being found on high mountains today is called Orogeny Tectonics. With no radioactive isotopes, the Earth's geography would be vastly different and void of life. If radioactivity produced twice as much heat the earth would become unstable.
The discovery of fossil ammonites within rocks at the highest mountains on Earth is due to orogenic plate tectonics. Plate tectonics is the name we use to describe a process in which pieces of the earth's crust move and often slam into each other, causing one of these to pile onto the other.
This can lead to the formation of mountains and mountain ranges. This process helps to explain why fossils of ammonites known to dwell in the ocean can be found in mountains.
Radioactive isotopes, or better yet, the decaying of radioactive isotopes, are responsible for generating most of the Earth's internal heat. The internal heat of the earth is the driving force of plate tectonics and without it, much of the geological activities responsible for the earth's current geography would not have happened.
Mountain ranges would not have formedPlate tectonics would not have caused the formation of the continents we know todayThe earth would lack a magnetic field to defend against ionizing radiation from the sunLife would likely not have evolved.Radioactive isotopes were vital in allowing for the conditions of the earth at the time that life evolved, and the heat they produce allows the earth to have a molten core and thus generate a magnetic field for protection.
Now, if the heat produced by radioactive isotopes were to double, the Earth's internal temperature would nearly double. Since this heat is the driving force for plate tectonics, we can expect a sharp increase in the number of earthquakes and volcanic eruptions. These can, in turn, cause tsunamis and changes to the earth's global temperature. Mountains would form continuously and continents may break apart. This instability would make life on earth's surface improbable.
Therefore, the geological process responsible for fossils being found on high mountains today is called Orogeny Tectonics. Without radioactive isotopes, the Earth's geography would be vastly different and void of life. Radioactivity producing twice as much heat would make the earth very unstable.
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READING TOOL Sequence of Events List in order the parts of a typical experiment that uses
scientific methodology. Use the headings in your text as a guide.
Answers
Answer:
2. Background research
3.Create a hypothesis
4.Experiment to test the hypothesis
5.Analyse the data from the experiemnt
Explanation:
2. Learn about the topic and research on what you need for the experiment.
3.Form a hypothesis in which you want to be tested.
4. Do an experiment in which it tests your hypothesis.
5. Analyst the data from the experiment and draw conclusions and decide whether it tests your theory.
Which process must occur for a muscle to be able to relax?
ОА. .
The amount of ATP in the neuromuscular junction must increase.
OB. Myosin and actin must attach to each other.
OC.
A nerve must initiate an action potential in the muscle fiber.
OD
The concentration of calcium in the myofibril must decrease.
Answers
Answer:
D. The concentration of calcium in the myofibril must decrease.
what are general characteristics of algae ?
Answers
Answer:
1. it has not defined length..
2. it digest good in food vacoule
hlo
can we talk in comment section
Reproduction in algae occurs in both asexual and sexual forms.
During sexual reproduction, algae form differentiated sex cells that fuse to produce a diploid zygote with two sets of chromosomes.
can someone please tell me what bug this is?
Answers
Answer:
kinda looks like a cricket or grasshopper prob a cricket tho
Explanation:
Which of the following represents a population?
1 point
a single pigeon in a given area
a group of pigeons in a given area
a group of pigeons, mice and trees that live in a given area
all living things and non-living things in a given area
Answers
Answer:
A single pigeon in a given area
Explanation:
It tells us the actual number of pigeon in a specified area
What is biology??And what does it came from??
Answers
Answer:
BIOLOGY IS THE STUDY OF LIFE
Explanation:
Answer:
Biology is studying about life and the human body. The term biology in its modern sense appears to have been introduced independently by Thomas Beddoes (in 1799)
Hope this helps!
What is the definition of salinity ?
Answers
Answer:
Salinity pertains to the degree of saltiness or the relative proportion of salt in a solution. ... By definition, salinity in relation to limnology refers to the total amount of dissolved solids in water in parts per thousand by weight.
Answer:
Salinity is the saltiness or dissolved inorganic salt content of a body of water. Substances that are dissolved in water are usually called solutes.
Explanation:
please help!!
What are some factors that influence emotional changes throughout adolescence?
Answers
Answer:
Explanation:
Some of the factors that influence emotional changes during adolescence include, among others, changes in self-perception, changes in the way teens are treated, increased sensitivity to criticism, increased desire for independence, and an increased need to belong.
Which of the following is NOT true of enzyme activity? a. enzyme shape may change during catalysis b. the active site on an enzyme orients its substrate molecules, therby promoting interaction of their reactive parts c. all enzymes have an active site where substrates are temporarily bound d. each enzyme can catalyze a wide variety of different reactions
Answers
Answer:
D. Each enzyme can catalyze a wide variety of different reactions
Explanation:
Each enzyme can only catalyze a few, specific types of reactions.
Since enzymes and substrates are very specific to one another, enzymes cannot catalyze a wide variety of reactions.
If a substrate is not the correct one that fits in the enzyme's active site, a reaction will not occur.
So, each enzyme can only assist in a few reactions.
The correct answer is D. Each enzyme can catalyze a wide variety of different reactions
True or False: Within the body, all atoms combine to form molecules. If false, why?
Answers
Answer:
True
Explanation:
Two or more atoms combine to form a molecule, like how the water molecules, proteins, and sugars are found in living things.
Hope this helps! （づ￣3￣）づ╭❤～
The statement i.e. ''Within the body, all atoms combine to form molecules'' is true.
Atoms combine together to form molecules because atom is unstable substance which can't stay in single form due to its reactive nature but become stable when they form molecules due to filling of outermost shell and attain the electronic configuration of noble gases so we can say that atoms formed molecules in order to attain stability and can not remain individually.
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What is the Defenition of Metabolism?
a
When offspring change and develop over millions of years
b
When living things change over time.
c
The flow of chemical energy in an organism.
d
When an organism produces an offspring
Answers
The answer is
C. The flow of chemical energy in an organism.
Metabolism is the chemical processes that occur within a living organism in order to maintain life.
How do simple organisms exchange substances?
Answers
Answer:
A simple, unicellular organism (consisting of one cell) can rely on diffusion to move substances into and out of the cell. Its surface area is large compared to its volume , so nutrients and other substances can pass quickly through the membrane and around its 'body'.