Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 13, Problem 5GP
Summary Introduction
To explain: The probability that one of the surviving kittens with parents having the allele MLM associated with taillessness in Manx cats will be heterozygous.
Concept introduction: The mutated ML allele is associated with taillessness in Manx cats. The homozygous MLML allele is called as lethal alleles, as they cause death of the kitten as embryo itself due to defects of the spinal cord. Lethal alleles are those in heterozygous or homozygous form that causes death of the individual during embryonic development itself. The probability reduces in such cases, as those alleles will not be transferred to the next generation as the allele is lost with the death of the embryo.
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In giraffes, long neck is dominant to short neck. Long neck is denoted by the dominant allele, N, while short neck is denoted by a recessive allele, n. Write the genotype and phenotype for the following organisms: homozygous dominant organism, homozygous recessive organism, and heterozygous organism.
In fruit flies, the dominant H allele gives rise to a hairless phenotype, hh gives rise to normal body bristles, and the HH homozygote condition is lethal during an embryonic stage. The presence of a dominant S allele suppresses the effect of the dominat H allele with respect to the body bristles phenotype such that normal body bristle phenotype is restored when only one dominant H allele is present (HH is lethal irrespective of the S or s alleles). The ss genotype has no effect over the H allele and the SS homozygote condition is also lethal during an embryonic stage. What would be the expected phenotypic outcomes among the surviving offspring from the following cross:
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Identify each of the following as an example of allele, genotype, and/or phenotype frequency:
A. Approximately 1 in 2500 people of Northern European descent is born with cystic fibrosis.
B. The percentage of carriers of the sickle cell allele in West Africa is approximately 13%.
C. The number of new mutations for achondroplasia, a genetic disorder, is approximately 5 × 10–5.
Chapter 13 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 13 - Prob. 1DAACh. 13 - Prob. 2DAACh. 13 - Prob. 3DAACh. 13 - Prob. 1SQCh. 13 - An organisms observable traits constitute its...Ch. 13 - Prob. 3SQCh. 13 - Prob. 4SQCh. 13 - The offspring of the cross AA aa are ________. a....Ch. 13 - Refer to question 5. Assuming complete dominance,...Ch. 13 - A testcross is a way to determine ________. a....
Ch. 13 - Assuming complete dominance, a cross between...Ch. 13 - The probability of a crossover occurring between...Ch. 13 - True or false? All traits are inherited in a...Ch. 13 - One gene that affects three traits is an example...Ch. 13 - The phenotype of individuals heterozygous for...Ch. 13 - _______ in a trait is indicated by a bell curve....Ch. 13 - Match the terms with the best description. ______...Ch. 13 - Mendel crossed a true-breeding pea plant with...Ch. 13 - Assuming that independent assortment occurs during...Ch. 13 - Refer to problem 2. Determine the predicted...Ch. 13 - For each genotype listed, what allele combinations...Ch. 13 - Prob. 5GPCh. 13 - Suppose you identify a new gene in mice. One of...Ch. 13 - Mutations in the TYR gene may render its enzyme...Ch. 13 - In sweet pea plants, an allele for purple flowers....Ch. 13 - Red-flowering snapdragons are homozygous for...
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