What is the difference between primary and secondary sex characteristics?

What is the difference between primary and secondary sex characteristics?

• A. Primary characteristics are reproductive organs present at birth, while secondary characteristics develop during puberty.
• B. Primary are external, secondary internal.
• C. Primary only appear in females, secondary in males.
• D. Primary are hormonal, secondary are neurological.

Answer: (A)

The main idea here is what parts of the body are involved and when they appear during development. Primary sex characteristics are the reproductive organs themselves—internal and external genitalia and gonads—that are present from birth (anatomically) and become functional for reproduction. Secondary sex characteristics are the visible signs of maturation that arise during puberty due to hormonal changes but are not directly needed for reproduction, such as breast development, body and facial hair, voice deepening, and changes in body fat distribution. So the best description is that primary characteristics are reproductive organs present at birth, while secondary characteristics develop during puberty.

The main idea here is what parts of the body are involved and when they appear during development. Primary sex characteristics are the reproductive organs themselves—internal and external genitalia and gonads—that are present from birth (anatomically) and become functional for reproduction. Secondary sex characteristics are the visible signs of maturation that arise during puberty due to hormonal changes but are not directly needed for reproduction, such as breast development, body and facial hair, voice deepening, and changes in body fat distribution. So the best description is that primary characteristics are reproductive organs present at birth, while secondary characteristics develop during puberty.