Biology Lecture on Sexual Selection and Mating Systems

These flashcards help in reviewing key concepts from the biology lecture on sexual selection and mating systems.

Meiosis reduces the number of chromosome sets from __________ to __________.

diploid to haploid

The process of __________ is effectively identical to mitosis.

Meiosis II

The key step in __________ is chromosome reduction.

Meiosis I

One explanation for why species differ in which traits they consider sexy is __________.

sensory bias

According to __________, females choose males displaying signals of high genetic quality.

the 'good genes' hypothesis

Sexual selection can occur when individuals vary in their __________ success.

mating

The sex experiencing stronger sexual selection will typically have __________ traits.

more extreme

Intrasexual selection refers to competition for mating success among __________.

individuals of one sex

Intersexual selection is also known as __________.

mate choice

Hamilton's rule provides a solution to the evolutionary dilemma of __________ and parental investment.

cooperation

Internal fertilization usually results in females being certain that their offspring are her own, but __________ are not certain.

males

In a monogamous mating system, both sexes are removed from the mating pool after __________.

mating

The operational sex ratio is a measure of the relative number of __________ and __________ available to mate at any moment.

males and females

The __________ predicts that the sex that invests the most time and energy in offspring will be the choosey sex.

parental investment theory

The mating system that results when females aggregate and males can defend access to many is called __________.

polygyny

Why is monogamy common in birds? Because __________ care is common.

biparental

The evolution of sexual dimorphism can result from the process of __________ selection.

sexual

In external fertilizing species, males are often more certain of paternity than females of their __________.

maternity

The four major types of mating systems are polygamy, polyandry, monogamy, and __________.

promiscuity