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PS02 - recessive More than one answer may be possible for...

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Problem Set #2: due 9/8 Remember, you must show all your work to receive credit! 1) Imagine a diploid organism with heterogametic males with 2 total pairs of chromosomes, consisting of one pair of autosomes and one pair of heteromorphic sex chromosomes. Draw the stages, and say how many chromatids and chromosomes are present, in the following stages of cell division in males: a) metaphase of mitosis? b) metaphase I of meiosis? c) metaphase II of meiosis? d) end products of meiosis? 2) Tiger swallowtail butterflies are usually yellow with black stripes. However, sometimes females are found that are almost solid black. Black males are never found in the wild. Propose a genetic explanation for this observation, and suggest an experiment to test your hypothesis. 3) Which of the following modes of inheritance are possible for each of the pedigrees shown below: a) autosomal dominant; b) autosomal recessive; c) X-linked dominant; d) X-linked
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Unformatted text preview: recessive. More than one answer may be possible for each pedigree. List all possible answers and briefly explain why. i. ii. iii. iv. 4) Two fruit flies mate; one is a wild type male and the other is a yellow-bodied female. The 57 daughters are all wild type, while the 49 sons are all yellow. a) What is the mode of inheritance of yellow? b) One of the wild type daughters from the cross above is crossed to a yellow male. Oddly, they produce only 7 offspring, all of which are female. What is the probability that there will be 6 yellow females and 1 wild type female? Extra credit: Meiosis I explains Mendel’s laws. Describe the phenotype of a mutant in the cell cycle that would disrupt Mendel’s first law (segregation). Describe the phenotype of a mutant in the cell cycle that would disrupt Mendel’s second law (independent assortment). Recommended optional problems: CH2: 2 4, 5, 9, 10, 26. CH3: 35, 36. CH7: 1, 6, 11, 14, 26....
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