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hw1key - GeneticsHomework#1AnswerKey 1 Normally,...

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Genetics Homework #1 – Answer Key 1. Normally, a diploid meiocyte divides during meiosis I to yield two haploid secondary meiocytes. These undergo another division (meiosis II) to produce four haploid gametes. Imagine that you are studying the products of meiosis in a novel insect species. You see that instead of a haploid secondary meiocyte, these insects produce a diploid secondary meiocyte. The gametes are still haploid, however. Diagram the process of meiosis in this novel insect by drawing the primary meiocyte, the secondary meiocyte, and the gametes produced. Your insect has 2 pairs of chromosomes, one long and metacentric with the marker A on one copy, a on the other copy; the other chromosome pair is short and telocentric with the marker B on one copy, b on the other. Contrast this with a similar diagram of normal meiosis side‐by‐ side. Show only one possible combination for the A and B markers. Normal meiosis has two divisions, first one reductional, second one equational. In this insect, however, the two divisions are reversed. We start with a 2n cell containing 4 chromosomes, 8 DNA molecules, and it undergoes an equational division to yield 2 cells, both still 2n, each with 4 chromosomes and 4 DNA molecules. These then undergo the reductional division to yield 4 cells total, each
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