DRAW OUT SET UP, CROSSES, PUNNET SQUARES AND GIVE AN EXPLANATION. 1) red-green c

Question

DRAW OUT SET UP, CROSSES, PUNNET SQUARES AND GIVE AN EXPLANATION.

1) red-green color blindness is a sex-linked recessive trait in humans. two people with nnormal color vision have a color-blind son. what are the genotypes of the parents?

2.) a human disease called pseudohypertropic muscular dystrophy is inherited as a sex linked recessive trait. the disease is characterized by a wasting away of the muscles, beginning about age 6, so that by the time affected persons are in their teens, they are almost literally skin and bones; they usually die before reaching adulthood. suppose however, that a boy with the disease lives past puberty and marries a woman heterozygous for the trait. if they have a son, what is the probability that he will have the disease? explain, in details , with appropriate charts with explanations.

Explanation / Answer

1.

Xc- x-linked allele that causes red-green colour-blindness

X+ - refer to the wild type version of the allele

As, both of the parents have normal vision, their genotype should be

Female: X+Xc

Male: X+Y

X+

Y

X+

X+ X+

X+Y

Xc

Xc X+

XcY

Let x refer to as defective recessive allele,

And X refers to as wild type allele.

Genotype of the boy:

xY

Genotype of the girl:

Xx (heterozygous)

Cross the parents:

So, they have 50% of probability of having defective son.

X+

Y

X+

X+ X+

X+Y

Xc

Xc X+

XcY

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