Question

Define
Secondary sexual characters
Ovulation

Answer 1

Secondary sex characteristics are features that indicate genetic fitness to the opposite sex, but unlike sex organs, they are not directly part of the reproductive system. They can give an individual an advantage over its rivals in courtship and aggressiveinteractions, and are believed to be the product of sexual selection. These characteristics appear during puberty in humans, and at sexual maturity in other animals. They are particularly noticeable in the sexually dimorphic phenotypic traits that distinguish the sexes of a species. Secondary sex characteristics differ from primary sex characteristics, the sex organs, because they are not directly necessary for sexual reproduction to occur.

Secondary sex characteristics include manes of male lions and long feathers of male peacock, the tusks of male narwhals, enlarged proboscises in male elephant seals and proboscis monkeys, the bright facial and rump coloration of male mandrills, and horns in many goats and antelopes, and these are believed to be produced by a positive feedback loop known as the Fisherian runaway produced by the secondary characteristic in one sex and the desire for that characteristic in the other sex. Male birds and fish of many species have brighter coloration or other external ornaments. Differences in size between sexes are also considered secondary sexual characteristics.

In humans, visible secondary sex characteristics include pubic hair, enlarged breasts and widened hips of females, and facial hair and Adam's apple on males.

Answer 2

Secondary sexual characters are the characters that actually determine the sex of an individual and help us to identify the sex partners and attract them .

The different sexual characters are :

Hair and beard .

Deep voice in males.

Breast in females.

These do not participate in reproduction but help to attract partners only.

Ovulation is the formation of ovum .

It is a part of menstrual cycle.