Dr. Peterson has a ranch outside Nipomo; on that ranch he has a herd of anteater

Question

Dr. Peterson has a ranch outside Nipomo; on that ranch he has a herd of anteaters. Some of his anteaters are striped, while others are plain. In order to investigate how coat pattern is inherited in anteaters, he carried out a number of crosses.
A mating between a pure-breeding (i.e. homozygous) plain male anteater and a pure-breeding striped female anteater produced the following progeny:
F1: 1/2 striped males : 1/2 Plain females
When the F1 progeny were interbred, the following progeny were seen: F2: 1/4 plain males : 1/4 Striped males : 1/4 Plain females : 1/4 Striped females
Explain how the genetic control of stripedness works in anteaters.

Explanation / Answer

Plain, is a sex linked dominant trait... striped is sex linked recessive.

p= striped allele P= plain allele

If we say pure breed homozygous plain male is XP Y (P supposed to be super script.)

and pure breed homozygous striped female is Xp Xp (p supposed to be super script.)

then, F1... all males = Xp Y = all striped

all females = XP Xp = all plain

then, F2... Males split 50/50 between XP Y and Xp Y. Females split 50/50 between XP Xp and Xp Xp

this means 1/4 plain males : 1/4 Striped males : 1/4 Plain females : 1/4 Striped females.

overall conclusion:

Stripedness is a sex-linked recessive trait in ant eaters. while plain is sex-linked dominant. Proof above.

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