Chapter 6

Question 1

Sexual dismorphism

Answer 1

Different forms within a species

Secondary sex characteristics

Question 2

Intrasexual Selection

Answer 2

The direct competition among individuals of one sex for mates of the opposite sex

Male

Question 3

Intersexual Selection

Answer 3

Members of one sex or choosy in selecting their mates from individuals of the other sex

Females

Question 4

Why are females choosy in mates?

Answer 4

More energy to produce eggs

More energy invested in young, healthy offspring

Fems lose more with bad mate

Better genes

Question 5

Classes of female mate choice

Answer 5

Direct benefit
Good Gene
Runaway Selection

Question 6

Direct benefit

Answer 6

Females are a limited resource

Only females with genetic predisposition can be choosy

Question 7

Major Histocompatability Complex (MHC)

Answer 7

Disease resistance gene that produces a protein that indentifies foreign cells, highly variant

Question 8

Developmental stability

Answer 8

Measure of how well an organism handles changing environment as it matures

Determined by bodily symmetry

Question 9

Runaway Selection

Answer 9

When mate choice gene and preferred traits associate

Question 10

Sexual imprinting

Answer 10

When young animals learned what a good mate is from observing adults