Chapter 10, Problem 1TY

Summary Introduction

Introduction:

Sexual characteristics are physical and behavioral traits of an organism which indicates the biological sex of an organism. Sexual characteristics include sex organs used for reproduction and characteristics which distinguish the two sexes of a species but are not directly part of the reproductive system.

Answer to Problem 1TY

Correct answer:

The primary sex characteristics are directly involved in human reproduction. Therefore, option d. is correct.

Option d. is given as “are directly involved in human reproduction”.

Explanation of Solution

Reasons for the correct statement:

The primary sex characteristics are the characteristics with which a person is born and these characteristics compose of reproductive organs that directly participate in reproduction.

Hence, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “include the development of pubic and ancillary hair”.

Development of pubic and ancillary hair is a secondary characteristic feature which occurs at puberty. Hence, it is a wrong answer.

Option b. is given as “always begin their development during puberty”.

The primary sex characteristics are present during the time of birth but secondary sex characteristics appear at the time of puberty. Hence, it is a wrong answer.

Option c. is given as “are typically the same for males and females”.

The primary sex organ of males consists of a pair of testes and that for a female is a pair of ovaries. Hence, it is a wrong answer

Hence, options a., b., and c. are incorrect.

Conclusion

The primary sex characteristics are the primary sex organs that are present at the time of birth and participate directly during reproduction.