Chapter 6 Answers to Homework Problems

Chapter 6 Answers to Homework Problems - Chapter 6 Answers...

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Chapter 6 Answers to Homework Problems 3. Questions and Problems, 6.3 During meiosis, why do some tetraploids behave more regularly than triploids? Ans: In allotetraploids, each member of the different sets of chromosomes can pair with a homologous partner during prophase I and then disjoin during anaphase I. In triploids, disjunction is irregular because homologous chromosomes associate during prophase I by forming either bivalents and univalents or by forming trivalents. 4. Questions and Problems, 6.4 The following table presents chromosome data on four species of plants and their F 1 hybrids: Meiosis I metaphase Species or F1 Hybrid Root tip chromosome number Number of bivalents Number of univalents A 20 10 0 B 20 10 0 C 10 5 0 D 10 5 0 A × B 20 0 20 A × C 15 5 5 A × D 15 5 5 C × D 10 0 10 (a) Deduce the chromosomal origin of species A. (b) How many bivalents and univalents would you expect to observe at meiotic metaphase I in a hybrid between species C and species B? (c) How many bivalents and univalents would you expect to observe at meiotic metaphase I in a hybrid between species D and species B? Ans: (a) Species A is an allotetraploid with a genome from each of species C and species D; (b) 0 bivalents and 15 univalents; (c) 0 bivalents and 15 univalents. 5.
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Chapter 6 Answers to Homework Problems - Chapter 6 Answers...

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