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MindTap Biology, 1 term (6 months)...

14th Edition
Cecie Starr + 3 others
ISBN: 9781305269842

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BuyFindarrow_forward

MindTap Biology, 1 term (6 months)...

14th Edition
Cecie Starr + 3 others
ISBN: 9781305269842

Textbook Problem

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

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

Correct answer:  A heterozygous individual has a pair of nonidentical alleles for a trait being studied. Therefore, option b. is correct.

Explanation

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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