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A couple has a phenotypically normal son who upon

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2. A couple has a phenotypically normal son who, upon inspection of his sex chromosomes, is found to be XYY. In what parent, and in what meiotic division, could the nondisjunction causing this constitution have happened? 5. In corn, root tip cell nuclei normally have 2 n = 20 chromosomes. How many chromosomes would be typical of root tip cell nuclei in (a) a monosomic. (b) a trisomic. (c) a monoploid. (d) a triploid. (e) a tetrasomic. (f) an autotetraploid. 6. The red fox has 17 pairs of large, long chromosomes. The arctic fox has 26 pairs of smaller shorter chromosomes. What do you expect to be the chromosome number in somatic tissues of the hybrid? 7. Describe errors in the formation of gametes or fertilization that might produce a triploid zygote. 10. Diagram the early anaphase configuration of the bivalent in problem 9 if a chiasma occurred between d and e . 22. In the following pedigree the shaded symbols represent a rare X-linked disease of the blood. The propositus has 45 chromosomes and is sterile. Propose a single mechanism to account for both the sterility and the blood disease in this female.
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