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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Chapter 5 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
Ch. 5.5 - Prob. 1GRCh. 5.5 - What are the possible advantages or disadvantages...Ch. 5 - After hearing this information, should Sue and Tim...Ch. 5 - Can cleft lip be surgically corrected? Sue and Tim...Ch. 5 - If the child showed a cleft lip through ultrasound...Ch. 5 - Describe why continuous variation is common in...Ch. 5 - The text outlines some of the problems Frederick...Ch. 5 - What role might environment have played in causing...Ch. 5 - Do you think Frederick Williams experiment would...Ch. 5 - As it turned out, one of the tallest Potsdam...
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 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
- Given 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_forwardAside from the Punnett square, are there other ways to understand the inheritance of traits in humans, animals and/or plants? Give at least one and describe if there is.arrow_forwardFor 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_forward
- A genotypic ratio of 2:4:2:2:4:2 is possible between a male who is heterozygous free earlobes and heterozygous freckles, and a female who is homozygous free earlobes and heterozygous. Free earlobes is a dominant trait. Key: E = free earlobes e = attached earlobes F = freckles f = no freckles ○ If the first statement is FALSE and the second statement is TRUE O If both statements are TRUE If the first statement is TRUE and the second statement is FALSE O If both statements are FALSEarrow_forwardThe trait for red hair is recessive (r) to the trait for brown hair (R). What is the probability that two parents, one with red hair and one heterozygous for brown hair will have 6 children, 4 with brown hair and 2 with red hair?arrow_forwardIn domestic cats, the dominant allele A encodes pigmented fur and the recessive allele a encodes white fur. Two cats with Aa genotypes have a litter of kittens. For each kitten, what is the probability that the kitten has pigmented fur? Hint: it may be helpful to draw a Punnett square.arrow_forward
- A heterozygous fair male had a conjugal interaction with a homozygous dark female. Using an appropriate genetic diagram, explain the genotypic and the phenotypic appearance of the second filial generation of these parents. Note: Darkness is dominant over fairness.arrow_forwardGiven that there is a trait determined by the alleles A and a, where A is dominant, i.e., the presence of A determines the phenotype. Assume that two parents have four children, and assume that nothing is known about the parents. One of the four children shows the recessive condition (so its genotype is aa) and the other three show the dominant trait (so their genotype is either Aa or AA). What can we conclude about the parents? Group of answer choices - at least one parent shows the dominant trait - Both parents are heterozygous - Both parents have at least one recessive allelearrow_forwardDimpling in the cheek is controlled by a dominant allele while non-dimpling is recessive. Determine the phenotypes for both you and your partner. What possible genotypes could produce these phenotypes? What genotypic and phenotypic ratios would you expect in your offspring?arrow_forward
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