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
Tatiana [17]
3 years ago
12

If a blue eyed mother with a normal vision has a brown eyed color blind son and a blue eyed colored blind daughter what are the

genotype of the parents and the children
Biology
1 answer:
Rina8888 [55]3 years ago
8 0

Answer: mother: XX^aa, father: X^YAa, son: X^YAa, daughter: X^X^aa.

Explanation:

Color blindness is a genetic disorder that affects the ability to distinguish colors. It is hereditary and is transmitted by an X-linked recessive allele. If a male inherits an X chromosome with the altered allele he will be color blind. In contrast, females, who have two X chromosomes, will only be colorblind if both of their X chromosomes have the altered allele. This is because <u>males have one X chromosome and one Y chromosome, while females have two X chromosomes</u>.  

If the woman has normal vision, that means she cannot have both chromosomes affected. She can only have one affected chromosome (be a carrier) or none at all. Also, if she has blue eyes, which is a recessive trait, then both alleles are recessive. But the eye color is not on the X chromosome. For example, her eye color genotype can only be aa, because if she had at least one dominant allele she would have brown eye color. As for the other trait, she can be XX^, with X^ being an affected (carrier) allele or XX, i.e. both normal. So in summary, her genotype can be XXaa or XX^aa  

If she has a brown-eyed male child who is also colour blind, he has inherited the allele for colour blindness from his mother, since the father does not pass on an X chromosome to the male children, only the Y. With this we can now rule out the mother's XXaa genotype since she had to have passed on her affected X^ chromosome. Then the genotype of the mother is XX^aa. And since her mother can only pass on one allele to (recessive) because she does not have allele A, the dominant that determines her brown eye color can only come from the father. So the genotype of this son is X^YAa. The female daughter has color blindness and blue eyes. So she had to inherit the affected X^ chromosome from the mother (which we already know she has) and an affected X^ chromosome from the father, because the daughter needs to inherit both affected X^ chromosomes to develop the disease. And if she also has blue eyes, she had to have inherited a recessive allele from the mother and another from the father. So with this information we can say that the father's genotype can only be X^YAa. Because the father must have both A and A alleles of the same eye color, because he passed the dominant one to the son and the recessive one to the daughter. At last, the genotype of the daughter is X^X^aa.

You might be interested in
How do the skin’s three layers differ?
ololo11 [35]

Answer:

Because they all have a different purpose

Explanation:

The epidermis provides a waterproof barrier and creates our skin tone.

The dermis, the middke layer of skin , contains tough connective tissue, hair follicles, and sweat glands.

The  hypodermis is made of fat and connective tissue.

7 0
2 years ago
Read 2 more answers
Helium has an atomic number of 2. Is the model of the helium atom above is
77julia77 [94]

Answer:

Yes, the model of the helium atom is showing an ion.

Explanation:

Helium, with an atomic number of 2, should have 2 protons and 2 electrons; however, the model only depicts 1 electron. That means the helium must have lost an electron, making it a +1 charge and an ion.

4 0
3 years ago
How does gravity cause erosion?
-BARSIC- [3]

Answer:

By pulling down rocks and particles.

Explanation:

For example, in a cliff, where rocks are being pulled down by gravity. Their particles and small pieces of rock are forced to fall apart, slowly eroding down any rock or sediment.

3 0
3 years ago
What do we us everyday that harms us?
Rina8888 [55]

cars put pollution in the air and it harms our lungs same with smoking

mark brainliest;)

8 0
3 years ago
Read 2 more answers
during meiosis chromosome pairs randomly line up along each side of the cell equator this arrangement mixes up the chromosomal c
drek231 [11]

During meiosis, chromosome pairs randomly line up along each side of the cell equator. This arrangement mixes up the chromosomal combinations, which  

A. helps ensure reproductive success.  

B. helps create and maintain genetic diversity.

C. helps maintain all of the previous generation's characteristics.

D. helps ensure an equal number of males and females in the next generation.

7 0
3 years ago
Other questions:
  • Which genetically engineered medicine is used to treat patients who have growth defects? insulin flu shot human growth hormone p
    6·2 answers
  • Which process drives darwin theory of evolution​
    13·1 answer
  • The three-domain system recognizes fundamental differences between two groups of A. prokaryotes. B. eukaryotes. C. protists. D.
    11·1 answer
  • The correct route of administration for long-acting forms of penicillin is: a. Intramuscular b. Intravenous c. Oral d. Sublingua
    8·1 answer
  • According to the principal of dominance, if a recessive gene for tallness is paired with another recessive gene for tallness, th
    13·1 answer
  • Which structures are found in every living cell​
    15·2 answers
  • Water soluble molecules often enter or exit a cell in what process?
    14·1 answer
  • What does DNA stand for
    15·2 answers
  • sally took antibiotics for several weeks. how would your gut react to the antibiotics after that long
    10·1 answer
  • Both the Psoas major muscle and iliacus muscle insert on the __________. intertrochanteric crest greater trochanter of the femur
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!