life science

posted by .

ok i really need help. like really bad. cant figure it out. ok here it is.

a color blind man marries a woman with normal vision. of their three daughters, one is color blind. one of their two sons is also colorblind. what are the genotypes of the parents?

please help me its confusing!

color blindness is x-linked recessive. The father is obviously xy, where x means the bad gene for color blindness. Now, what is the mother? Since one of the daughters is color blind, the mother must also have bad gene. She is good and one bad...Xx. If the mother had both good genes, none of the kids would be color blind, and if the mother had both bad genes, ALL the kids would be color blind. Do you see this?

ya i see it now. kinda... lol. thanks.

wait couldn't the mom and the dad both be xy? casue 2/5ths of there kids are color blind

nope. y is the male gene. Mom can't be xy...then she'd be a he!!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. science

    can a color blind female have a son that has normal vision?
  2. Biology

    . A woman whose father was color blind (X-linked, recessive) and who has type A blood has accused a man who is himself color blind of fathering her child. The accused man has type B blood. For each of the following cases, indicate …
  3. biology help

    color blindness is a sex linked disorder caused by recessive allele on the X chromosome. XC= normal vision. Xc= color blind. if a normal vision man marries a color blind woman, what are the chances that they will have a color blind …
  4. Biology

    GENETICS PRACTICE PROBLEMS Worth 10 points each problem is either right or wrong 1. In humans, assume that brown eyes (B) are dominant over blue eyes (b). A blue eyed man, both of whose parents were brown eyed, marries a brown eyed …
  5. Science

    Write a paragraph explaining why a color-blind man who has three daughters and one son with normal color vision might have two grandsons who are color-blind. Use the terms in the vocabulary box in your answer. Underline each term. …
  6. 6th grade science - CHECK MY ANSWER

    A color-blind woman marries a man who is not color-blind. All of their sons are color-blind, but none of their daughters are color-blind. Color-blindness is likely...?
  7. biology

    if a color blind woman marries a man with normal vision,how do you set up punnett square?
  8. science

    a colorblind woman marries a man who isn't colorblind. All of their sons are color blind but none of their daughters are color blind. color blindness is likely 1)the result of having two few chromosomes 2)the result of having and extra …
  9. Biology

    Color Blindness is inherited as a sex linked recessive. If a color blind woman marries a man with normal vision, what would you expect in their children?
  10. genetics and breeds

    A woman with a normal vision whose father was colour blind marries a man with normal vision whose father was also colour blind. This couple has a colour blind daughter with normal complement of chromosomes. Is infidelity suspected?

More Similar Questions