Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 5, Problem 18QP
If monozygotic twins show complete concordance for a trait, whether they are reared together or apart, what does this suggest about the heritability of the trait?
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Given a cross between these two parents:
BbCcDDEEFfGgHhJj x BbCcddEeFfGgHHjj
where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following:
How many possible gametes can the first individual produce?
What proportion of the offspring will phenotypically resemble the first parent?
What proportion of the offspring will genotypically resemble the second parent?
How many phenotypes can be expected from the cross?
Given a cross between these two parents:
BbCcDDEEFfGgHhjj x BbCcddEeFfGgHHjj
where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following:
What proportion of the offspring will phenotypically resemble the first parent?
What proportion of the offspring will genotypically resemble the second parent?
How many phenotypes can be expected from the cross?
A cross between an orange-brown male and a homozygous black female produce four kittens. What is the phenotypic probability of the offspring?
probability of the offspring?
Chapter 5 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
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Ch. 5 - Describe why there is a fundamental difference...Ch. 5 - Sunflowers with flowers 10 cm in diameter are...Ch. 5 - Clubfoot is a common congenital birth defect. This...Ch. 5 - Define genetic variance.Ch. 5 - Define environmental variance.Ch. 5 - How is heritability related to genetic and...Ch. 5 - Why are relatives used in the calculation of...Ch. 5 - If there is no genetic variation within a...Ch. 5 - Can conjoined (Siamese) twins be dizygotic twins...Ch. 5 - Dizygotic twins: a. are as closely related as...Ch. 5 - Why are monozygotic twins who are reared apart so...Ch. 5 - Monozygotic (MZ) twins have a concordance value of...Ch. 5 - If monozygotic twins show complete concordance for...Ch. 5 - Researchers set up an obesity study in which MZ...Ch. 5 - What does the ob gene code for? How does it work?...Ch. 5 - What is the importance of the comparison of traits...Ch. 5 - Height in humans is controlled by the additive...Ch. 5 - If diseases such as cardiovascular disease...Ch. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Suppose that a team of researchers analyzes the...
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- Why are monozygotic twins who are reared apart so useful in the calculation of heritability?arrow_forwardA trait exhibits 100% concordance in both monozygotic and dizygotic twins. What conclusion can you draw about the role of genetic factors in determining differences in the trait?arrow_forwardIn humans, the alleles for unattached earlobes is dominant over the allele for attached earlobes. The allele for dark hair dominates the allele for light hair. If both parents are heterozygous for earlobe attachment and hair color, what types of offspring can they produce, and what is the probability for each type?arrow_forward
- Given a cross between these two parents: BbCcDDEEFfGgHhjj x BbCcddEeFfGgHHjj where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following: What proportion of the offspring will genotypically resemble the second parent?arrow_forwardA 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?arrow_forwardWhat is the importance of the comparison of traits between adopted and natural children in determining heritability?arrow_forward
- The achoo syndrome (sneezing in response to bright light) and trembling chin (triggered by anxiety) are both dominant traits in humans. What is the probability that the first child of parents who are heterozygous for both the achoo gene and trembling chin will have achoo syndrome but lack the trembling chin? What is the probability that the first child will have neither achoo syndrome nor tembling chin?arrow_forwardThe allele for hitchhiker’s thumb (h) is recessive to straight thumb (H). If a man and his wife are both homozygous recessive, will any of their offspring potentially have hitchhikers thumb? What is the man’s genotype and the woman’s genotype? What is the man’s phenotype and the woman’s phenotype? What genotype(s) must the offspring have in order to have the phenotypic trait of hitchhiker’s thumb? Do a cross to determine all potential hitchhiker’s thumb genotypes and phenotypes for the offspring of this man and woman. Is it possible for any offspring of the F1 generation to have hitchhiker’s thumb?arrow_forwardThe achoo syndrome (sneezing in response to bright light) and trembling chin (triggered by anxiety) are both dominant traits in humans. What is the probability that the first child of parents who are heterozygous for both the achoo gene and trembling chin will have achoo syndrome but lack the trembling chin? What is the probability that the first child will have neither achoo syndrome nor trembling chin?arrow_forward
- For the polydactyly trait, P = polydactylous (having 6 fingers), p= normal (having 5 fingers). What is the probability (at each ,ating) that two parents who are both homozygous dominant for the trait will produce a 6 fingered offspring? 0% 25% 50% 75% 100%arrow_forwardGiven the parents AaBb x Aabb, assume simple dominance for each trait. What proportion of the offspring will be expected to phenotypically resemble the first parent? 1/4 1/8 3/4 3/8 1arrow_forwardAssume that attached earlobes are an autosomal recessive trait with 73% penetrance. If one parent is heterozygous (Aa) and the other homozygous recessive (aa) for the attached earlobe gene, what is the probability that their second child will have attached earlobes? O 73% O 36.5% O 50% O 63.5% O 27% O 13.5% O 18.75%arrow_forward
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