Question

What are the primary and secondary sexual characters?
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Answer 1

Primary and secondary sexual characteristics are physical traits that make males and females look and behave differently from each other in certain species, including humans. Primary sexual characteristics are those that are present at birth, and are determined by chromosomes’ influence on hormones in utero for mammals, and on other factors such as egg incubation temperature for some reptile species.

Secondary sexual characteristics appear during puberty. These characteristics are not used in sexual reproduction, but are important for attracting a mate - such as long tusks or brightly colored scales - or being able to provide care for offspring - such as human breasts or marsupial pouches.

Males in sexually dimorphic species typically have ornamented appearances and behaviors, such as the peacock’s flashy plumage or numerous birds’ specialized dances or songs, in order to attract females. The choosy female theory purports that females choose males with bigger, brighter and better ornamentation to increase the viability of her offspring by choosing a mate with good genes. This may either be because her sons are more likely to have those same attractive traits, perpetuating her genes or because those traits are associated with strength and resilience to disease, making them more likely to survive in order to reproduce.
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