Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 22, Problem 13P
In a certain plant, leaf size is determined by four genes whose alleles assort independently and act additively. Thus, alleles A, B, C, and D each add 4 cm to leaf length and alleles A′, B′, C′, and D′ each add 2 cm to leaf length. Therefore, an AA BB CC DD plant has leaves 32 cm long and an A′A′ B′B′ C′C′ D′D′ plant has leaves 16 cm long.
| a. | If true-breeding plants with leaves 32 cm long are crossed to true-breeding plants with leaves 16 cm long, the F will have leaves 24 cm long and the genotype AA′ BB′ CC′ DD′. List all possible leaf lengths and their expected frequencies in the F generation produced from these F plants. (Hint: Recall Problem 45e in Chapter 2.) | ||||||||||||||||||||||||
| b. | Now assume that in a randomly mating population the following allele frequencies occur:
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| c. | What proportion of the plants in the population described in part (b) will have leaves that are 32 cm long? |
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Pigments in some bears are the result of epistasis between 2 genes. The black coat color is only produced when both wildtype forms of genes D and E are present. When gene D (D-ee) is wildtype alone, offspring are white. When gene E (ddE-) is wildtype alone, offspring are brown. When no wildtype alleles are present (ddee) offspring are all white. Based on this describe the relationship between the genes D and E.
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Part A: If the two genes are 30 mu apart and the plant is (AB/ab), what proportion of gametes from a single plant will be AB?
Enter your answer as a decimal to three places (for example: 0.120).
Part B: If the two genes are 30 mu apart and the plant is (AB/ab), what proportion of gametes from a single plant will be Ab?
Part C: If the two genes are 30 mu apart and the plant is (AB/ab), what proportion of gametes from a single plant will be aB?
Part D: If the two genes are 30 mu apart and the plant is (AB/ab), what proportion of gametes from a signal plant will be ab?
Chapter 22 Solutions
Genetics: From Genes to Genomes
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Ch. 22 - Prob. 11PCh. 22 - Two alleles at one locus produce three distinct...Ch. 22 - In a certain plant, leaf size is determined by...Ch. 22 - Compare and contrast the use of SNP genotyping: i...Ch. 22 - Explain the similarities and differences between...Ch. 22 - In Fig. 22.14c, the fw2.2 causal gene was...Ch. 22 - Among the most prevalent pathologies that afflict...Ch. 22 - Human geneticists have found the Finnish...Ch. 22 - Canavan disease, caused by homozygosity for a...Ch. 22 - In GWAS analysis, because of the existence of LD...Ch. 22 - In Fig. 22.15: a. Why do some chromosomes in the...Ch. 22 - Consider the triangle diagram shown in Fig. 22.17....Ch. 22 - Prob. 23PCh. 22 - You conduct a Case/Control study comparing the...Ch. 22 - Prob. 25PCh. 22 - ALS amyotrophic lateral sclerosis is a rare, fatal...Ch. 22 - Through GWAS explorations, scientists have...Ch. 22 - In domesticated dogs, size has a high...Ch. 22 - Suppose a GWAS investigation found a particular LD...Ch. 22 - In 2008, Time magazine named as its invention of...
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