Evolution Questions 1. Questions related to how males compete for mating oppurtu

Question

Evolution Questions

1. Questions related to how males compete for mating oppurtunities would be considered a ______ questions, whereas questions related to why females choose males for mating would be considered _____ questions

a. Adaptive, Mechanistic

b. Phylogenetic, Proximate

c. Proximate, Ultimate

d. Ultimate, Developmental

2. The most important factor determining the direction and strength of sexual selection is

a. Inbreeding coefficient

b. Offspring size

c. Parental investment

d. Relatedness

3. Sperm competition would be considered a form of

a. Antagonistic pleiotropy

b. Intrasexual selection

c. Intersexual selection

d. Runaway selection

4. Necessary preconditions for runaway selection of male sexual traits include all of the followimg EXCEPT

a. Assortative mating

b. Genetic variation for female preference

c. Genetic variation for male trait

d. Polyandry

5. In some populations of stalk-eyed flies, males produce only X-bearing sperm due to a meiotic drive, resulting in female biased sex ratio distortion in those populations. The long eye-stalk trait has been found to be linked to an allele on the Y chromosome that suppresses meiotic drive. Selection should favor females that prefer long eye-stalk males because______ are more valuable in these populations

a. Females

b. Males

c. X chromosomes

d. Autosomes (non-sex chromosomes)

Explanation / Answer

2) b. Offspring size. The ratio of sexually active males to fertilizable females (operational sex ratio, OSR) determines the level of competition for mates and hence thedirection and strength of sexual selection

3) b. Intrasexual selection. where the members of the same sex competes for access to members of the opposite sex.

5) c. X chromosomes

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