True or False? Mate choice is important on animal species behavior. Male and fem

Question

True or False? Mate choice is important on animal species behavior. Male and female animals often differ in the cost of reproduction and therefore have different behaviors

True or False? Natural selection is the sum of survival and fertility mechanisms that affect reproductive success.

Question!

Water fleas, Daphnia magna, can switch between asexual and sexual reproduction cycles. Which of the following observations support the hypothesis that sex is favored in unpredictable environments?

Select one:

a. The introduction of predators triggers sexual reproduction.

b. D. magna reproduces asexually every other generation in a variety of habitats.

c. D. magna reproduces sexually when its aquatic habitat dries up.

d. Asexual D. magna strains outcompete introduced competitors.

e. A and C

Question

Reciprocal altruism can be best explained with a model proposed by Trivers in 1971: If one individual (A) pays some cost to help another individual (B), but the cost is recovered at some point in the future (when B helps A), then natural selection might favor behaviors that lead to this type of reciprocity. In which of the following situations is reciprocal altruism likely to occur?

Select one:

a. in dynamic large populations where individuals rarely interact with the same set of partners

b. in eusocial groups such as termites, ants, and other such species

c. in large populations of marine invertebrates

d. in stable groups, with ongoing interactions with the same set of partners

Explanation / Answer

1-Mate choice is important on animal species behavior. Male and female animals often differ in the cost of reproduction and therefore have different behaviors - True

2- Natural selection is the sum of survival and fertility mechanisms that affect reproductive success. - True

3- under adverse condition males and sexual reproduction start apart from that females laying eggs by the asexula reproduction so c. D. magna reproduces sexually when its aquatic habitat dries up. is correct because adverse condition occur in habitate

4- Stephan shows the conditions for the Reciprocal altruism. these conditions are

these condition must be follow for the reciprocal altruism. basically it is symbiosis type of interaction. so d is the correct answer because it shows all the criteria is needed for the reciprocal altruism.

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