Question

question 14
1 point
a beardless male mates with a female. they produce a brood of 9 males and 8 females. every one of the males is bearded. what was the most likely beard genotype of the female?
bb
bb
bb
clear selection
question 15
1 point
last saved 7:50:51 pm

Explanation:

Step1: Identify male genotype

A beardless male has genotype $bb$ (since bearded is dominant, $B$; beardless is recessive, $b$).

Step2: Analyze male offspring inheritance

Male offspring get their $B/b$ allele from the mother (they inherit the Y chromosome from the father, so the beard allele comes exclusively from the female). All male offspring are bearded, meaning they all received a dominant $B$ allele.

Step3: Evaluate female genotype likelihood

If the female were $Bb$, there would be a 50% chance of passing $b$ to male offspring, resulting in some beardless males. If the female were $bb$, all male offspring would be beardless. Only a $BB$ female can only pass a $B$ allele, ensuring all male offspring are bearded.

Answer:

A. BB