PracticExamWk6 - Bio180 Sixth Practice Exam Thursday,...

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Unformatted text preview: Bio180 Sixth Practice Exam Thursday, November 8 th 12:30-1:20 p.m. Question 1 Suppose that a plant lineage lacking alternation of generations evolved from an angiosperm ancestor. For this to happen, what alterations would have to occur in the meiotic products of the angiosperm microsporangium and megasporangium? Question 1, Sample answer: The haploid cells produced by a microsporangium would have to develop into sperm cells, instead of dividing by mitosis to form a pollen grain. The haploid cells produced by a megasporangium would have to develop into eggs, instead of dividing by mitosis to form a female gametophyte. Question 2 Defend the claim that sexual selection occurs in plants, and that it is particularly intense in angiosperms that are pollinated by animals (versus wind pollinated species or species without pollen, where sperm swim to the egg). Question 2, Sample answer Sexual selection is based on heritable variation and differential success in obtaining mates. In angiosperms that are pollinated by animals, obtaining mates means attracting an animal pollinator. It is logical to predictthat are pollinated by animals, obtaining mates means attracting an animal pollinator....
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