Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 13, Problem 1SQ
A heterozygous individual has a _______ for a trait being studied.
- a. pair of identical alleles
- b. pair of nonidentical alleles
- c. haploid condition, in genetic terms
Expert Solution & Answer
Summary Introduction
Concept introduction: The pair of chromosomes where one of the pairs is of the maternal source and the other is of the paternal source that has genes in the same loci with variable alleles of the gene is called homologous chromosomes. The allele is the modification of the gene. The alleles are of two types, namely dominant and recessive.
Answer to Problem 1SQ
Correct answer: A heterozygous individual has a pair of nonidentical alleles for a trait being studied. Therefore, option b. is correct.
Explanation of Solution
Reasons for the correct statement:
Homozygous individuals have the same alleles on the gene loci either dominant homozygous or recessive homozygous. Heterozygous individuals have one dominant allele and one recessive allele. Thus, two different types of alleles of the same gene are present in the gene loci that are not identical to each other.
Option b. is given as “a pair of nonidentical alleles”
As heterozygous individuals possess different alleles of the same gene for the trait expressed, option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “a pair of identical alleles”.
Homozygous individuals only have the same allele on both homologous chromosomes that is, the pair of identical alleles. Therefore, option a. is incorrect.
Option c. is given as “haploid condition, in genetic terms”.
Haploid condition refers to half the number of chromosomes. A heterozygous individual has two sets of chromosomes. Therefore, option c. is incorrect.
Hence, options a. and c. are incorrect.
Conclusion
A heterozygous individual has two different alleles that are dominant and recessive and are studied for phenotypic traits.
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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 terms
When a trait is only expressed in the presence of two identical alleles, the genotype is
Select one:
a. Heterozygous dominant
b. Heterozygous recessive
c. Homozygous dominant
d. Homozygous recessive
Which pedigree demonstrates the inheritance of an autosomal trait? Why
A.
Figure 14.1
B.
Figure 14.2
Chapter 13 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 13 - A heterozygous individual has a _______ for a...Ch. 13 - An organisms observable traits constitute its...Ch. 13 - Prob. 3SQCh. 13 - The second-generation offspring of a cross between...Ch. 13 - Prob. 5SQCh. 13 - Refer to question 5. Assuming complete dominance,...Ch. 13 - Prob. 7SQCh. 13 - Prob. 8SQCh. 13 - The probability of a crossover occurring between...Ch. 13 - True or false? All traits are inherited in a...
Ch. 13 - Prob. 11SQCh. 13 - The phenotype of individuals heterozygous for...Ch. 13 - Prob. 13SQCh. 13 - Match the terms with the best description. ______...Ch. 13 - Assuming that independent assortment occurs during...Ch. 13 - Refer to problem 2. Determine the predicted...Ch. 13 - Refer to problem 2. Assume a third gene has...Ch. 13 - Prob. 4GPCh. 13 - Suppose you identify a new gene in mice. One of...Ch. 13 - Mendel crossed a true-breeding pea plant with...Ch. 13 - Several alleles affect traits of roses, such as...Ch. 13 - Prob. 1DAACh. 13 - Prob. 2DAACh. 13 - Prob. 3DAACh. 13 - Mutations in the TYR gene may render its enzyme...Ch. 13 - In sweet pea plants, an allele for purple flowers....Ch. 13 - Red-flowering snapdragons are homozygous for...Ch. 13 - A single allele gives rise to the Hbs form of...
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