Answer to Question #185342 in Genetics for Bianca Isabel Limon

Question

1.    In humans, color blindness is a recessive, sex-linked trait. A colorblind father is married to a normal, carrier mother. Show the Punnett square solution below, and determine the possibility of obtaining the following offsprings: (only 1 Punnett square solution needed; 2 pts for the Punnett square solution)

 

Punette square:

 

a.    A female, colorblind offspring (1 pt)

 

 

b.    A male, normal offspring (1 pt)

 

 

 

c.     A male, colorblind offspring (1 pt)

Answer 1

Color blindness is an X-linked trait

Let the gene for color blindness be denoted by n

Thus the allele for normal color vision is N

Parental genotypes are thus     XⁿY            x                 X^NXⁿ

Parental gametes are;                   

 

 

 

a. Zero (0)

b. $\dfrac{1}{2}$

c. $\dfrac{1}{2}$