Lecture 7 - SEX

Question 1

Costs of Sexual reproduction

Answer 1

1. Cost of meiosis
2. Cost of producing males
3. Cost of courting, mating and caring for offspring

Question 2

Why is Sexual reproduction a stable system?

Answer 2

Faster Evolution

• better response to change in env.
• Rate of genotype change directly related to level of variability in gene pool

-Sexual reproduction increases heterogeneity

Question 3

What is Isogamous

Answer 3

Both males and females produce gametes of similar size

Equal energetic investment by both parties

Question 4

What is Anisogamous

Answer 4

Males and females = unequal sized gametes

Unequal energetic investment

Results in very different strategies for either sex.

Question 5

Different reproduction strategies may arise from what?

Answer 5

Limits on reproductive success

Females limited by number of viable eggs she can produce

Males limited by number of potential mates

Question 6

Effect of sexual selection and parental investment

Answer 6

If one invests more energy than the other, the lower investing should compete for the higher invest.

Question 7

What results from energy investment in gametes?

Answer 7

Sexual conflict

Parental investment

Question 8

What is Parental Investment

Answer 8

Invest by the parent in an individual offspring that increases the offspring’s chance of surviving.