HW2f07key - Bio 132 Question Set 2 Key 1 Many animals are...

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Bio 132: Question Set 2 Key 1. Many animals are capable of kin discrimination. A young mammal imprints on the odor of its kin and when sexually mature, avoids mating with animals that smell like kin. How would a biologist explain the evolution of kin discrimination behavior using the mechanism ( three conditions ) of natural selection? Remember to work in the three conditions of natural selection for these kinds of questions -variation, heritability, differential reproduction. So something like: There was variation among mammals in the ability to discriminate using odor cues. Each generation, those mammals that are better able to use odor cues to discriminate kin will be less likely to mate with kin. Therefore, those "discriminating" animals will have healthier offspring and higher reproductive success. They pass on the genes that allow for better kin discrimination based on odor and their offspring therefore have higher reproductive success than animals that do not have this ability. Since this characteristic leads to higher reproductive success and animals that possess it contribute more copies of their genes to the next generations, over time, more and more of the animals in the population are better able to discriminate kin. 2. a. What are the sources of variation in a population (how does variation arise)? -Mutations (changes in genes and chromosomes) -Segregation (sorting) of chromosomes during the formation of eggs and sperm -Recombination as a result of sexual reproduction b. What is a biological “adaptation”? An adaptation is a characteristic or trait that contributes to an individual’s survival and reproductive success (fitness). We would therefore expect that the genes underlying the characteristic or trait would be passed on to the next generations. Therefore, this trait would be present as the result of natural selection. c. Not all traits are necessarily adaptive.
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HW2f07key - Bio 132 Question Set 2 Key 1 Many animals are...

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