Human Heredity: Principles and Issues (MindTap Course List)
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 4, Problem 27QP

Variations in Phenotype Expression

A genetic disorder characterized by falling asleep in genetics lectures is known to be 20% penetrant. All 90 students in a genetics class are homozygous for this gene. Theoretically, how many of the 90 students will fall asleep during the next lecture?

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"How to Solve Genetic Problems" Using Letters for Alleles For convenience, the genes of an allele pair are usually symbolized by a letter from the alphabet. A large letter is used for the dominant trait and a small letter for the recessive trait. When we want to describe the genotype of an organism, we use both letters to represent the alleles inherited from the parents. For example, free earlobes is a dominant allele and attached earlobes is recessive. You would use a capital "F" to indicate the dominant allele and a small “f" to indicate the recessive allele in describing an individual. 1. Write the three genotypes for earlobe attachment as it applies to the following individuals. a. Heterozygous b. Homozygous Dominant c. Homozygous Recessive 2. When it comes to symbolizing incomplete dominance with letters, it is best to use the letter "C" for one allele and "C'" for the other allele. List the three possible genotypes for hair type. a. Curly b. Wavy c. Straight. Why not use a small…
Normal wife Affected husband As a genetic counsellor you are presented with a married couple where one of them has a family history of this disease. The husband is affected by this disease and the wife is normal. The couple, who are thinking of starting a family, would like to know what their chances are of having a child born with this condition. They would also like to know what the probabilities are of having an affected boy or affected girl. Use the symbols above to complete the diagram right and determine the probabilities stated below (expressed as a proportion or percentage). Parents 4. Determine the probability of having: Gametes (a) Affected children: Possible (b) An affected girl: fertilizations (c) An affected boy: O O O O Children Affected aite if 耳
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Human Heredity: Principles and Issues (MindTap Course List)

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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY