Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 20, Problem 4SQ
Summary Introduction
Introduction: Gene code for a particular trait. Genes are located on the chromosome. Linked genes are located very close together and they do not undergo crossing over in meiosis.
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Mendel'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.
The probability of a crossover occurring between two genes on the same chromosome_____ . a. is unrelated to the distance between them b. decreases with increasing distance between them c. increases with the distance between them
A cross between two pea plants with genotypes PpLI and PpLI results in an F1 generation that is 25% PPLL, 50% PpLI, and 25% ppll. Which reason most likely explains why other possible genotypes are not present?
Choose 1 answer.
A.The genes underwent independent assortment
B.The loci of the genes are close together.
C.The loci of the genes are on different chromosomes.
D.Crossing over occurred between chromosomes.
Chapter 20 Solutions
Human Biology (MindTap Course List)
Ch. 20 - Prob. 1RQCh. 20 - What is a carrier of a genetic trait?Ch. 20 - What evidence indicates that a trait is coded by a...Ch. 20 - Prob. 4RQCh. 20 - Explain what nondisjunction is, and give two...Ch. 20 - _______ segregate during ______. a. Homologues;...Ch. 20 - Prob. 2SQCh. 20 - Genes on the same chromosome tend to stay together...Ch. 20 - Prob. 4SQCh. 20 - A chromosomes structure can be altered by _______....
Ch. 20 - Nondisjunction can be caused by ________. a....Ch. 20 - A gamete affected by nondisjunction could have...Ch. 20 - Genetic disorders can be caused by __________. a....Ch. 20 - A person who is a carrier for a genetic trait...Ch. 20 - Prob. 10SQCh. 20 - If a couple has six boys, what is the probability...Ch. 20 - Human sex chromosomes are XX for females and XY...Ch. 20 - People with Down syndrome have an extra copy of...Ch. 20 - Prob. 4CTCh. 20 - Prob. 5CTCh. 20 - About 4 percent of people of Northern European...Ch. 20 - The following pedigree shows the pattern of...
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- Two pea plants that are true-breeding for recessive white flowers are mated and their offspring analyzed. Which of the following statements about this situation is true? Group of answer choices A)The offspring represent the P generation. B)The gametes produced by the offspring will carry only one allele for this gene. C)Both parents are referred to as heterozygotes. D)Half of the offspring will be true-breeding for white flowers.arrow_forwardTwo normal-looking fruit flies were crossed, and, in the progeny, there were 202 females and 98 males.a. What is unusual about this result?b. Provide a genetic explanation for this anomaly.c. Provide a test of your hypothesis.arrow_forwardRed-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? Group of answer choices A. color blind daughters, normal vision sons B. color blind sons, normal vision daughters C. all color blind D. all normal visionarrow_forward
- A purebred plant that produces yellow seeds (YY) is crossed with a purebred plant that produces green seeds (yy). The seeds of all of the offspring are yellow. Why? A. The yellow allele is recessive to the green allele. B. All of the offspring are homozygous yellow. C. The alleles are codominant. D. The yellow allele is (completely) dominant to the green allele.arrow_forwardThe term cross refers to an experiment in whicha. the gametes come from different individuals.b. the gametes come from a single flower of the sameindividual.c. the gametes come from different flowers of the sameindividual.d. both a and c are truearrow_forwardGreen coloration is a recessive trait in pea plants. If you crossed a green pea plant with a green pea plant, the offspring could be what genotype? A. Homozygous Dominant B. Green C. Homogygous Recessive D. None of the above.arrow_forward
- Scurs in cattle is a sex-influenced trait. A cow with no scurs whosemother had scurs had offspring with a bull with scurs whose fatherhad no scurs. What are the probabilities of each of the followingcombinations of offspring? A. The first offspring will not have scurs.B. The first offspring will be a male with no scurs.C. The first three offspring will be females with no scursarrow_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_forwardA plant that is homozygous for the recessive yellow pod color is crossed with a plant that is heterozygous. Which phenotype will appear MOST in the offspring? A. There will only be plants with green pods. B. There will be more plants with green pods. C. There will be more plants with yellow pods. D. Plants with yellow and green pods will appear in equal numbers.arrow_forward
- is the term for a a person who has two different alleles at the same gene (locus) and both of these alleles are expressed. Group of choices (a)Recessiveness (b)Homozygosity (c)X-linkage (d)Codominantarrow_forwardWhat is the reason for doing a test cross? a. to identify heterozygous individuals with the dominant phenotype b. to determine which allele is dominant and which is recessive c. to identify homozygous recessive individuals in the F2 d. to determine if two genes assort independentlyarrow_forwardThe bananas you purchase in the grocery store in the United States, are the product of asexual propagation methods. Which of these processes produces genetic variation in the bananas that you eat with your breakfast cereal? Select all that apply. A.) Crossing-over B.) Independent assortment C.) Mutationarrow_forward
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