Question

ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual dimorphism is the phenomenon that caused biologists to focus on sexual selection. 32. ( pts) What is the most important basic underlying difference between the sexes that causes sexual selection to usually operate differently in males than in females? A. The cost of reproduction is usually higher in females. B. The cost of reproduction is usually higher in males. C. Males have only 1 X chromosome, females have 2. 33.2 pts) True or False. Males usually experience greater variance in reproductive success than do females. 34. (2 pts) Which of the following is an example of intersexual selection. Put an X by your selection A female bird evolves a preference for larger males because large size indicates that the male is not parasitized and therefore she won't get parasites. This causes males to be larger than females. _ Large males beat the crap out of small males, and therefore get the best mating territories. This causes males to be larger than females 35. (3 pts) Satellite males (or sneaky copulators) are A females that don't mate with dominant males B. males that don't get to mate. C. males that take advantage of larger males who have attracted females. D. are often males that look like females 36. (3 pts) Which of the following is true about additive gene action A. For a single locus, completely additive action is when the heterozygote's phenotype is exactly halfway between the phenotypes of the two homory gotes. B. Additive action occurs when the effect of the allele depends on which other alleles are present in the multilocus genotype. C. Additive action occurs when the effect of the allele is independent of the other alleles are present in the multilocus genotype. Bonus question (1 pt). You are blindfolded. You have a well-shuffled deck of cards that is normal except that 10 of the cards are face up and the rest are face down. You bet some sucker $100 that you can split the deck into two piles, each pile having the same number of face up cards. You win every time. How can you do this without physically damaging the deck or cheating)?

Answer 1

31) Sexual dimorphism is defined as the difference in physical traits such as color, appearance, built, hair and muscle strength between the male and female individuals of the same species. So, this sexual dimorphism has caused the biologists to look for sex selection. Therefore, the given statement is true.

32) The cost of reproduction is usually higher in females when compared to males. This is because females lay eggs or carry the offsprings which come at a higher energy cost. So, the answer for this question is option A.