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 14QP
Can conjoined (Siamese) twins be dizygotic twins in light of the theory that conjoined twins result from incomplete division of the embryo?
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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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- How to determine if twins are identical or fraternal if only one still alive?arrow_forwardwhar are the meiotic events that could lead to the birth of an individual with either Patau syndrome or Turner syndrome?arrow_forwardButterflies have an X-Y sex-determination system that is different from that of flies or humans. Female butterflies may be either XY or X0, while butterflies with two or more X chromosomes are males. This photograph shows a tiger swallowtail gynandromorph, which is half male (left side) and half female (right side). Given that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, propose a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Question is also in the picture.arrow_forward
- In humans, baldness (Xᵇ) is a recessive sex-linked trait. Two people with normal hair (Xᴮ) have a bald son. What are the genotypes of the parents?arrow_forwardWhat are the two types of twins and how do they arise?arrow_forwardTable 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a second sex chromosome. Can Turner syndrome be due to nondisjunction during oogenesis, spermatogenesis, or both? If a phenotypically normal couple has a color-blind child (due to a recessive X-linked allele) with Turner syndrome, did nondisjunction occur duringoogenesis or spermatogenesis in this child’s parents? Explain your answer.arrow_forward
- What are twins?Genetically what are the twotypes of twins that can begenerated?arrow_forwardWhy do human sex-linked recessive traits typically show up in sons more than daughters? Hint: consider the probabilities involved in the inheritance of such traits.arrow_forwardExplain the process by which monozygotic and dizygotic twins might be formed.arrow_forward
- In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sexreversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this cross.arrow_forwardWhat is recessive epistasis?arrow_forwardHow does meiosis explain the first law of Mendel?arrow_forward
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