Could you please assist me with the fallowing question from hell, I will also ne

ID: 13882 • Letter: C

Question

Could you please assist me with the fallowing question from hell, I will also need help setting up the punnett square.

Night blindness is an X linked, recessive trait. Assumet that a woman who is heterozygous for the night blindness trait has children with a man who has night blindness
A. If they have daughter,and son what are the probabilities that they will..
1. be phenotypically normal and not be the carrier for the desease?
2.be phenotypically normal and be the carrier for the desease?
3.Have the disease?
(punnett square for each male and female)
If I need to break up this question, I will just let me know!

Explanation / Answer

Night blindness is an X linked, recessive trait.

Assumet that a woman who is heterozygous for the night blindness trait has children with a man who has night blindness

woman who is heterozygous for the night blindness---------- XC X

man who has night blindness--------------------------------------- XC Y

XC XC

AFFECTED FEMALE

XC X

NORAML –CARRIER ---- FEMALE

XC Y

AFFECTED MALE

X Y

NORAML –MALE

A. If they have daughter,and son what are the probabilities that they will..

½ OF FEMALES NORMAL (50%)

½ OF MALES NORMAL (50%)

1. be phenotypically normal and not be the carrier for the desease?

¼ =25%
2.be phenotypically normal and be the carrier for the desease?

¼ =25%
3.Have the disease?

½ OF FEMALES AFFECTED WITH night blindness

½ OF MALES AFFECTED WITH night blindness