Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 19, Problem 2SQ
A heterozygote has _____.
- a. only one of the various forms of a gene
- b. a pair of identical alleles
- c. a pair of contrasting alleles
- d. a haploid condition, in genetic terms
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Red-green color blindness is a recessive trait in humans. The locus is on the X chromosome. If a color blind woman marries a normal vision man, what kind of children could they have?
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The genotype of an individual with the dominant phenotype can bedetermined best by reproduction witha. a homozygous recessive c. the dominant phenotype.individual. d. None of these are correct.b. a heterozygote.
Color blindness in men is controlled by a recessive gene located on the X chromosome. Can a brother and sister with color blindness have another normal brother?
A. Yes, if the mother is a carrier.
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D.Yes, if the father is a carrier.
Chapter 19 Solutions
Human Biology (MindTap Course List)
Ch. 19 - Define the difference between (a) gene and allele,...Ch. 19 - Prob. 2RQCh. 19 - What is probability, and how is it applied in...Ch. 19 - What is independent assortment? Does independent...Ch. 19 - Alleles are ___________. a. alternate forms of a...Ch. 19 - A heterozygote has _____. a. only one of the...Ch. 19 - Prob. 3SQCh. 19 - Offspring of a cross AA aa are ______. a. all AA...Ch. 19 - Prob. 5SQCh. 19 - Prob. 6SQ
Ch. 19 - Which statement best fits the principle of...Ch. 19 - Prob. 8SQCh. 19 - Prob. 9SQCh. 19 - Prob. 10SQCh. 19 - One gene has alleles A and a. Another has alleles...Ch. 19 - Still referring to Problem 1, what will be the...Ch. 19 - Go back to Problem 1, and assume you now study a...Ch. 19 - The young woman shown at right has albinismvery...Ch. 19 - When you decide to breed your Labrador retriever...Ch. 19 - The ABO blood system has been used to settle cases...Ch. 19 - Prob. 7CTCh. 19 - A man is homozygous dominant for ten different...Ch. 19 - Prob. 9CTCh. 19 - Bill and Marie each have flat feet, long...Ch. 19 - You decide to breed a pair of guinea pigs, one...
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- A heterozygous individual has _______ for a trait being studied. a. the same allele on both homologous chromosomes b. two different alleles of a gene c. a haploid condition, in genetic termsarrow_forwardIn diseases with a recessive inheritance linked to sex (X chromosome), from the mother: A. 50% of women and 50% of men are affected. B. The woman is always affected by the disease. C. The man is always affected by the disease. D. 50% of women are affected.arrow_forwardMendel's pea plants were a good choice for studying heredity, because: a) They have lots of easily observable traits that vary in an either-or manner. b) Their mating is uncontrollable. c) There are separate male and female plants. d) The plants are incapable of cross-pollination.arrow_forward
- Polydactyly is a condition in which a person has extra fingersand/or toes. It is caused by a dominant allele. If a person carriesthis allele but does not have any extra fingers or toes, this is anexample ofa. haploinsufficiency.b. a dominant negative mutation.c. incomplete penetrance.d. a gain-of-function mutation.arrow_forward1. An albino man whose parents are both normal marries a woman ome of whose parents is normal and the other albino. She has an albino sister. The couple has a normal son. a.Is albinism a dominant or a recessive trait? Explain your answer B. Give genotypes of all the persons involved. C.The couple plans to have more kids. What is the probability of their second child being normalarrow_forwardIn humans, a trait that is “sex-linked”: a. is determined by a gene located on the 23rd chromosome b. appears more frequently in males than in females c. may be “carried” by females on one X chromosome but not the other d. All of these are true of sex-linked traitsarrow_forward
- A man and his wife are both heterozygous for brown eyes. They have ix children all of whom have blue eyes? A) How is it explained? B) What are the chances that their next child will have brown eyes? C) What are the chances that their next child will have blue eyes.arrow_forwardA woman who is heterozygous, Bb, has brown eyes; B (brown) isthe dominant allele, and b (blue) is recessive. One of her eyes,however, has a patch of blue color. Give three different explanationsfor how this might have occurred?arrow_forwardNO NEED TO EXPLAIN, JUST GIVE THE ANSWER In a genetic system of complete dominance, a recessive allele is expressed Select one: A. whenever it is present. B. only when it occurs on an autosome. C. only in the homozygous condition. D. only in the heterozygous condition.arrow_forward
- A cell that has two alleles at each locus is....? Group of answer choices a. diploid b. haploid c. homologous d. F1arrow_forwardA testcross with a homozygous dominant genotype should lead to progeny that: a. All have a homozygous dominant genotype b. All exhibit a recessive phenotype c. All exhibit a dominant phenotype d. All die, since exclusively homozygous recessive progeny are made e. Have a 3:1 dominant to recessive phenotypearrow_forwardCrossing over means the same as: a. incomplete dominance b. the process by which pieces of homologous chromosomes are exchanged c. heterozygosity d. the peculiar lineup of homologous chromosomes e. independent assortmentarrow_forward
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