Because he will be able to mate with more females, the genes for the superior fighting characteristic will become prevalent in the population; in other words, that characteristic will be naturally selected. Hormones, released by endocrine glands, work by the negative feedback mechanism.
We reported similar findings in gynecomastia in man. We will define the term and examine how these characteristics are seen in humans as well as in various animals.
The Self According to Rene Descartes. This content does not have an Arabic version. Anxiety, depression, self-harm, eating disorders, substance abuse and other problems can occur. Mayo Clinic; What is the difference between Primary and Secondary Sexual Characteristics?
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Gender dysphoria can also impair the ability to function at school or at work, resulting in school dropout or unemployment. Save Save Save. It is therefore proposed that gynecomastia probably results from failure of adequate testosterone action on the breast primordia during embryonic differentiation.
Physical Development and Health in Early Adulthood. Makadon HJ, et al. What teachers are saying about Study. Like this lesson Share. We will define the term and examine how these characteristics are seen in humans as well as in various animals.
This is because the enlarged larynxes push out the piece of cartilage in front of the larynx. Underarm hair and pubic hair are usually considered secondary sex characteristics,  but they may also be considered non-secondary sex characteristics because they are features of both sexes following puberty.
Views Read Edit View history. Browse Browse by subject. The female may also be more colorful, though in the insect world, it can go either way.