4. Monohybrid Sex-linked Problems Red-green color blindness is caused by a sex-l

Question

4. Monohybrid Sex-linked Problems Red-green color blindness is caused by a sex-linked recessive allele. A color-blind man normal vision whose father was color-blind. a woman with a. This couple has a daughter. What is the probability that this daughter is color-blind? b. This couple also has a son. What is the probability that this son is color-bind? 5. Dihybrid Inheritance Problem In pea plants, taliness and greon color are both dominant to short and yelow. It a tal green pea plant ) is crossed yth a tall greon pea plant(DGO, what are the phenotypes and genotypes of the offspring?

Explanation / Answer

The woman father was colour blind, that means his father has colour blind gene on X chromosome, thus his genotype is XaY , thus the woman will get one Xa chromosome from his father. Thus her genotype will be XaX. On the other hand the genotype of the man will be XaY, as he is colour blind.

XaX      X   XaY  

Xa

X

Xa

XaXa

XaX

Y

XaY

XY

a) the couple has a daughter, then the probability will be 25% ( XaXa).

b) the couple has a son, then the probability will be 25% ( XaY).

5.

Tall green pea X Tall green pea

                  TTGg X TtGg

TG

Tg

TG

TTGG

Tall, green pea

TTGg

Tall, green pea

Tg

TTGg            

Tall, green pea

TTgg

Tall, yellow pea

tG

TtGG

Tall, green pea

TtGg

Tall, green pea

tg

TtGg                    

Tall , grean pea

Ttgg

Tall, yellow

Xa

X

Xa

XaXa

XaX

Y

XaY

XY

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