Genetics Ch007

1. Questions and Problems, 7.1 Two yeast strains differing in three cerebrate genes were bum about over: A B C a b c. Among the tetrads that were analyzed, superstar contained the following spores: A B C, A b C, a B c, and a b c. How did this tetrad originate? autonomic nervous organization: A dickens-strand double hybridization must have occurred. Feedback: 7.1 obstacle: easy 2. Questions and Problems, 7.2 If two loci atomic number 18 13 cM apart, what proportion of the cells in pro manikin of the first meiotic division will contain a single cross in the region surrounded by them? autonomic nervous system: 26%. Feedback: 7.2 Difficulty: easy 3. Questions and Problems, 7.3 Genes a and b ar 20 cM apart. An a+ b+/a+ b+ individualistic was mated with an a b/a b individual. (a) diagram the cross and show the gametes produced by each advert and the genetic constitution of the F1. (b) (c) What gametes can the F1 produce, and in what proportions? If the F1 was cro ssed to a b/a b individuals, what offspring would be expected, and in what proportions? (d) Is this an example of the duo or repulsion gene linkage phase? (e) If the F1 were intercrossed, what offspring would be expected and in what proportions?

Ans: (a) bell ringer: a+ b+/a+ b+ a b/a b Gametes: a+ b+ from one parent, a b from the other F1: a+ b+/a b (b) 40% a+ b+, 40% a b, 10% a+ b, 10% a b+ (c) F2 from testcross: 40% a+ b+/a b, 40% a b/a b, 10% a+ b/a b, 10% a b+/a b (d) Coupling linkage phase (e) F2 from intercross: compend of phenotypes: a+ and b+ 66% a+ and b a and b+ 9% 9% a and b 16% Feedback: 7.1, 7.2 Difficulty: medium 4. Questions and Problems, 7.4 From a cr! oss between individuals with the genotypes Cc Dd Ee cc dd ee, 1000 offspring were produced. The frame that was C- D- ee include cd individuals. Are the genes c, d, and e on the same or different chromosomes? Explain. Ans: The class equal by 400 offspring indicates that at least two of the three genes are linked. Feedback: 7.1 Difficulty: easy 5. Questions and Problems, 7.5 If a is linked to b, and b to c, and c to d, does...If you motivation to get a liberal essay, order it on our website: BestEssayCheap.com

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