1 – Mitosis and Meiosis
1. A certain species has three pairs of chromosomes: an acrocentric pair, a metacentric pair, and a telocentric pair. Draw a cell of this species as it would appear in metaphase of mitosis. (BAP 2.18) 2. A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages? (BAP 2.20) a) G2 of interphase b) Metaphase I of meiosis c) Prophase of mitosis d) Anaphase I of meiosis e) Anaphase II of meiosis f) Prophase II of meiosis g) After cytokinesis following mitosis h) After cytokinesis following meiosis II 3. How would the answers to the above question change if the question had asked about centromeres and chromatids rather than chromosomes and DNA molecules? 4. The fruit fly Drosophila melanogaster has four pairs of chromosomes, whereas the house fly Musca domestica has six pairs of chromosomes. Other things being equal, in which species would you expect to see more genetic variation among the progeny of a cross? Explain your answer. (BAP 2.24) Calculate the number of possible chromosome combinations in the two fly species described above, then calculate the number of possible chromosome combinations in crosses unrelated individuals for each species. 5. Female bees are diploid and male bees are haploid. The haploid males produce sperm and can successfully mate with diploid females. Fertilized eggs develop into females and unfertilized eggs develop into males. How do you think the process of sperm production in male bees differs from sperm production in other animals? (BAP 2.29) 6. A mythical beast called the paradoxitaur (see, it’s an imaginary creature that only exists if you don’t believe in it) has cells that contain 14 chromosomes, some cells with 7 chromosomes and some with 28 chromosomes. It seems that it only has 7 linkage groups. Assuming all cells are normal and healthy, ...
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