Question

Question 10 0/1 pts Male-limited precocious puberty results from a rare, sex-limited autosomal allele (P) that is dominant over the allele for normal puberty (p) and is expressed only in males. Bill underwent precocious puberty, but his brother Jack and his sister Beth underwent puberty at the usual time, between the ages of 10 and 14. Although Bill's mother and father underwent normal puberty, two of his maternal uncles (his mother's brothers) underwent precocious puberty. What is the genotype of Bill? No answer text provided. Either PP or Pp

Answer 1

First, we should start by the cross of Bill's parents. If both parents did not expressed the disorder, the father must be pp. In the case of his mother, she have a uncle that underwent the precocious puberty, so she should be at least Pp. Lets make the Punnett Square Bill's parents cross Father pp x Pp + Mother | Pp Рp |р pp pp The genotype Pp or pp can be his sister Beth which is not affected The pp genotype is his brother Jack So, Bill must have a Pp genotype