study questions 15

study questions 15 - Study Questions 15 Genetics Solving...

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Study Questions 15. Genetics. Solving genetics problems is the only way to learn genetics. This set was contributed by Dr. Bonny Brewer, Department of Genome Sciences, University of Washington, Seattle 1. The sequence of a strand of DNA reads (from 5' to 3') AATCGGACTTACA. The comple- ment, also read in the 5' to 3' direction, is: (a) TTAGCCTGAATGT (b) TGTAAGTCCGATT (c) AATCGGACTTACA (d) ACATTCAGGCTAA (e) something else. 2. A cell with 10 pairs of chromosomes undergoes mitosis. How many chromosomes does each of the resulting cells have? Pick all correct answers. (a) 2 pairs (d) 10 (b) 5 (e) 10 pairs (c) 5 pairs (f) 20 (g) 20 pairs 3. A cell with 10 pairs of chromosomes undergoes meiosis. How many chromosomes does each of the resulting cells have? Pick all correct answers. (a) 2 pairs (e) 10 pairs (b) 5 (f) 20 (c) 5 pairs (g) 20 pairs (d) 10 NOTE: In peas, tall plant growth is dominant over dwarf. An F1 is a first-generation hybrid. An F2 is the result of crossing two F1s. 4. Let the allele for tall be represented by T and the allele for dwarfness by t. What will be the gametes produced by the parents and the height of the offspring (tall or dwarf) from each of the following crosses: Tt x tt; TT x Tt; Tt x Tt ? 5. A tall plant crossed with a dwarf one produces offspring of which about one-half are tall and one-half dwarf. What are the genotypes of the parents? 6. A cross between a tall and a dwarf plant produces 20 offspring, all tall. What is the probabili- ty of this happening if the tall parent is TT; if it is Tt ? - 1 -
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NOTE: In four-o'clock flowers, red flower color, R, is incompletely dominant over white, r. The heterozygous plants are pink-flowered. 7. In the following crosses in which the genotypes of the parents are given, what are the gametes produced by each parent, and what will be the flower color of the offspring from each cross: Rr x RR; rr x Rr; RR x rr; Rr x Rr ? 8. How would you produce four-o'clock seeds all of which would yield pink-flowered plants? 9. If the litter resulting from the mating of two short-tailed cats contains three kittens without tails, two with long tails, and six with short tails, what would be the simplest way of explain- ing the inheritance of tail length in these cats? Show genotypes. 10. In human beings, brown eyes are usually dominant over blue eyes. Suppose a blue-eyed man marries a brown-eyed woman whose father was blue-eyed. What proportion of their children would you predict will have blue eyes? 11. If a brown-eyed man marries a blue-eyed woman and they have ten children, all brown-eyed, can you be certain the man in homozygous? If the eleventh child has brown eyes, will that prove what the father's genotype is? If the eleventh child has blue eyes, will that prove what the father's genotype is? 12. A brown-eyed man whose father was brown-eyed and whose mother was blue-eyed married
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This note was uploaded on 06/07/2009 for the course BIS BIS2A taught by Professor Lucacomai during the Spring '09 term at UC Davis.

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study questions 15 - Study Questions 15 Genetics Solving...

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