The reason due to which pattern baldness is more common in males than in females even though the gene resides on an autosome. Introduction: There are obvious phenotypic differences among males and females. The differences between the sexes in humans are emphasized with the help of secondary sex characteristics which include the body size, the patterns of fat distribution, muscle mass, and the development of male or female sex organs such as penis or vagina, respectively. The phenotypic expression of a trait is different in some males and females. Sex-limited and sex-influenced traits are two reasons due to which this condition occurs.

Question

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 undergoes 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, his two maternal uncles (his mother's brothers) underwent precocious puberty. All of Bill's grandparents underwent normal puberty. Match the most likely genotypes for each relative in his family. If there is an equal likelihood of multiple genotypes for a relative, place each possible genotype. Relative Genotype Answer Bank Bill Pp PP PP Bill's brother Jack Bill's sister Beth Bill's father Bill's mother Bill's uncle Bill's grandfather Bill's grandmother

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Question

Chapter 7, Problem 15QP

Summary Introduction

To determine: The reason due to which pattern baldness is more common in males than in females even though the gene resides on an autosome.

Introduction: There are obvious phenotypic differences among males and females. The differences between the sexes in humans are emphasized with the help of secondary sex characteristics which include the body size, the patterns of fat distribution, muscle mass, and the development of male or female sex organs such as penis or vagina, respectively. The phenotypic expression of a trait is different in some males and females. Sex-limited and sex-influenced traits are two reasons due to which this condition occurs.

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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 undergoes 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, his two maternal uncles (his mother's brothers) underwent precocious puberty. All of Bill's grandparents underwent normal puberty. Match the most likely genotypes for each relative in his family. If there is an equal likelihood of multiple genotypes for a relative, place each possible genotype. Relative Genotype Answer Bank Bill Pp PP PP Bill's brother Jack Bill's sister Beth Bill's father Bill's mother Bill's uncle Bill's grandfather Bill's grandmother

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. Jack undergoes precocious puberty but his sister Janice undergoes puberty at the normal time. Jack's mother Joanna has one brother John who underwent precocious puberty. Jack's father underwent normal puberty. In this scenario, Jack's sister can be Pp or pp. True False

X-linked lissencephaly is an X-link dominant trait pertaining to a brain disorder. It superficially resembles an autosomal dominant trait because both the daughters and sons of an affected female parent can be affected. Mr. Panganiban is affected by the said disorder while his wife is not. Using your knowledge in predicting the genetic possibilities of the offspring, what do you think would happen to their sons and daughters in the first filial generation? Females affected by an X-link dominant have 50% for their sons and daughters to be affected. Father affected by the X-linked dominant trait can transmit the trait to all his daughters. Males with lissencephaly could transmit the genetic disorder for both sons and daughters. Lissencephaly is an X-link limited dominant trait. It usually affects males because they have only a single chromosome.