1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
77julia77 [94]
3 years ago
8

Red-green color blindness in humans is inherited as an X-linked recessive trait. Usually, heterozygous females are not colorblin

d. However, a doctor identified an unusual case in which a heterozygous female was colorblind in her right eye but had normal color vision in her left eye. If you assume that this phenotype was not due to a new mutation, explain how this might have occurred.
Biology
1 answer:
Maksim231197 [3]3 years ago
6 0

Answer:

The mentioned characteristics of variability are witnessed because of the phenomenon known as X chromosome inactivation in heterozygous females. As females possess two X chromosomes, they actually should not possess any color blindness.  

The phenomenon of X-chromosome inactivation takes place in a random manner at the time of embryo development. During this only one X chromosome is inactivated. If the chromosome comprising the defective gene is inactivated, the individual will possess normal vision.  

If the chromosome comprising the usual gene gets inactivated than the individual will be color blind. In the given case of female, X inactivation took place in one eye. The inactivation of normal alleles has taken place and thus she possesses normal vision with one eye and is color blind in the other eye.  

You might be interested in
PLZ HELP What would happen if a cell dissolved in water like sugar does
Ugo [173]

Water would move from outside to the inside of the cell through the semi permeable cell membrane and cause the cell to swell.

3 0
3 years ago
In guinea pigs, the color of the fur is determined by a single gene with two alleles control. The brown allele (B) is dominant o
Kipish [7]

Answer:

See

Explanation:

Given:

Brown allele (B) is dominant over the white allele (b).

It will be assumed that the alleles are not related to the X and Y chromosomes.

See attached diagram for details of the general case (for both homo-zygous and hetero-zygous parents)

For both parents hetero-zygous,

P1:

Genotype: Bb (100%)

Phenotype: brown (100%)

F1:

Genotypes : BB, Bb, bB and bb in equal proportions, i.e.

BB (25%), Bb (50%), bb (25%)

Phenotypes: 75% brown (from BB and Bb), 25% white (from bb)

8 0
3 years ago
Read the Mungo Lady and Mungo Man Do others in the field of anthropology agree with Dr. Thorne's view? Explain.
sweet [91]
I've read the story back a couple months ago

Actually, there are many archeologists and anthropologists disagree with dr. Thorne's view. Basically, Thorne strongly believes that what many calls Homo erectus was, in fact, Homo sapiens, and that they migrated out of Africa almost 2 million years ago and dispersed throughout Europe and Asia. That would actually be very different from what scientists have always believed about the evolution of the species. That is why many of them are against him)

I hope I helped :)

5 0
3 years ago
Read 2 more answers
What is one way that you eukaryotic cells differ from prokaryotic cells?
andrey2020 [161]
The biggest difference between prokaryotic and eukaryotic is that eukaryotic cells have a nucleus and prokaryotic cells do not.
4 0
3 years ago
Read 2 more answers
The school district wanted to determine whether the more expensive floor wax (Brand A) was better than the cheaper (Brand X) flo
erik [133]

Answer:

please help me on my question

7 0
2 years ago
Other questions:
  • Do you feel like reading today -3-
    7·2 answers
  • Which of the following is NOT an example of a graphic indicator which can help you understand the main purpose of a text? A. Sub
    5·1 answer
  • During which phase of mitosis do the nuclear membrane dissolve
    7·1 answer
  • BLANK  can disrupt cellular homeostasis and can even lead to uncontrolled cell division and the formation of cancers. (And it is
    10·2 answers
  • How does the paradise flycatcher protect its young from predators?
    14·2 answers
  • Use the information in the slide show and the textbook pages
    6·1 answer
  • What are these chromosomes consideredas?
    11·2 answers
  • If photosynthesizing green algae are provided with CO2 containing heavy oxygen (18O), later analysis will show that all of the f
    7·1 answer
  • Explain how temperature and amount of precipitation can affect the type of plants and animals found in the desert biome?
    9·2 answers
  • Why do multicellular organisms perform mitosis and meiosis ?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!