Sex linked: Let’s assume that the gene for prolific ear hair is on the X chromos

Question

Sex linked: Let’s assume that the gene for prolific ear hair is on the X chromosome and is a

recessive gene. Those will lots of ear hair (usually males) must have either ee (female) or e-

(male).

a. When males can only have one copy of a gene that is located on the X

chromosome, what kind of zygosity pattern do we call this?

b. If a female does not have hairy ears but whose father had hairy ears marries a man

without hairy ears, what percentage of female and male offspring will have hairy

ears?

c. What percentage of female offspring will be carriers for the prolific hairy ear

trait?

d. What if a female with hairy ears marries a man without hairy ears? What will be

the percentage of offspring (both make and female) with hairy ears?

e. What percentage of females will be carriers?

Explanation / Answer

Form the given data, the genotypes of males are:

The genotype of females is:

XeX (Normal; carrier)

a)

The pattern of zygosity is called Heterozygous-X-linked recessive inheritance (XeY; male).

b)

If females Mother is normal (XX), then the percentage of female offspring will have hairy ears zero and males have 25% of chance of occurrence. If the females Mother is affected (XeXe), then 50% of males affected and have hairy ears. None of females have hairy ears. If the female Mother is normal is heterozygous carrier (XeX), then None of the children have the hairy ears.

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