Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 17QP
Monozygotic (MZ) twins have a concordance value of 44% for a specific trait, whereas dizygotic twins have a concordance value of less than 5% for the same trait. What could explain why the value for MZ twins is significantly less than 100%?
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Chapter 5 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
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Why are monozygotic twins who are reared apart so useful in the calculation of heritability?
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A pedigree analysis was performed on the family of a man with schizophrenia. Based on the known concordance statistics, would his MZ twin be at high risk for the disease? Would the twins risk decrease if he were raised in an environment different from that of his schizophrenic brother?
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A table is given containing the concordance values for monzygotic and dizygotic twins - Based on this information, which trait has the highest heritability?
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If the heritability of a human trait is .50 at age six, what would you expect it to be at age 20?
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If the frequency of the recessive allele is 0.1, what is the frequency of the dominant allele?
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The following table shows the number of dogs for certain tail lengths in a population of dogs.
Tail Length
Number of Dogs
very short (less than 1 inch)
2
short (1–5 inches)
5
medium (5–10 inches)
15
long (10–15 inches)
5
very long (15–25 inches)
2
Based on this data, what type of trait is tail length in dogs?
(a) Mendelian
(b) codominant
(c)
(d) polygenic
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If at least one dominant allele at two different gene loci, A and B are required for normal hearing, what percent of the children would be able to hear normally from a cross between two individuals which are AABb and AaBb?
1/2
1/4
3/4
3/16
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. If the frequency of the homozygous recessive genotype is 0.81, what is the frequency of the recessive allele?
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What could be the genotypic and phenotypic ratios for a typical mendelian trait showed in the picture?
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