Ch. 10 reproduction 1/3m

Natural selection:

individuals whose genes help them survive will produce more offspring, and therefore those genes will spread in the population.

Sexual selection example:

males’ large antlers in some deer species are important for attracting mates. In many bird species, the male’s brightly colored feathers are important for attracting females.

Interest in Multiple Mates in Men:

These people can succeed by either of two strategies: be loyal to one person and devote your energies to helping raising kin, or mate with many and hope that some of them can raise babies without your help.

Interest in Multiple Mates in Men:

These people can succeed by either of two strategies: be loyal to one person and devote your energies to helping raising kin, or mate with many and hope that some of them can raise babies without your help.

Interest in Multiple Mates in Women

: Can sometimes gain from having multiple sex. If the partner is infertile, then mating with another could be the only way of reproducing. An extra sexual partner may provide support to children. In addition, there is the possibility of “trading up,” abandoning the first mate for a better one.

Interest in Multiple Mates in Women:

Can sometimes gain from having multiple sex. If the partner is infertile, then mating with another could be the only way of reproducing. An extra sexual partner may provide support to children. In addition, there is the possibility of “trading up,” abandoning the first mate for a better one.

Males of most other mammalian species:

seek multiple mates, and their behavior is almost certainly genetically based.

Mate-guarding or sexual jealousy:

The efforts made by an individual in a pairbonded relationship to protect their partner from potential romantic rivals, which may include tactics such as expressing love and affection, derogating rivals, and being vigilant for signs of interest from competitors. This occurs in many other mammals, but it is not universal.

Women reported higher jealousy if their partner became:

emotionally intimate with another woman than if he had sex with her.

Preferences for multiple partners

, we have no direct evidence of any gene that controls jealousy.

Mate-guarding or sexual jealousy:

The efforts made by an individual in a pairbonded relationship to protect their partner from potential romantic rivals, which may include tactics such as expressing love and affection, derogating rivals, and being vigilant for signs of interest from com petitors. This occurs in many other mammals, but it is not universal.

Men reported higher jealousy if their partner became:

sexually intimate with another than if one became emotionally intimate.

Typical romantic preference:

a person who is healthy, intelligent, honest, kind, and physically attractive, with religious and political beliefs similar to one’s own.

More likely than men to prefer a mate who is likely to be a good provider:

Women since when pregnant or taking care of a small child, she may need help with food and other requirement

Most male mammals with offspring:

provide little help to pregnant or nursing females.

Male genes:

have an X and a Y chromosome.

A few genes on the Y chromosome

active in the brain, at least one gene on the X chromosome is active only in the female brain

several genes on the X chromosome

produce larger effects in females

Recessive genes in Males:

Due to having one X chromosome, a recessive gene on the X chromosome shows its effects more often, including some effects that cause intellectual deficiencies

Prenatal testosterone:

This hormone as a greater effect on genetic males than on genetic females