Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 11, Problem 1MC
Summary Introduction

Introduction:

An organism’s genotype is the number of different alleles for a particular trait present in it, whereas phenotype is the characteristic of an organism that has appeared because if the type of allele it has. In genome, genes are present on the specific locus.

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Answer to Problem 1MC

Correct answer:

The physical position of a gene on a chromosome is its locus; slightly different forms of a gene are called alleles. Therefore, option (a) is correct.

Option (a) is given as “locus; alleles”.

Explanation of Solution

Justify reason for the correct statement:

An allele is any of the alternative forms of a gene that may occur at a specific locus and the combination of alleles for a genotype of an organism for expression of a particular phenotype.

Hence, option (a) is correct.

Justify reasons for the incorrect statements:

Option (b) is given as “locus; polygenic”.

The particular location of any gene in the genome is termed as locus and polygenic is an inheritance pattern of a trait that is controlled by the two or more genes. Hence, it is a wrong answer.

Option (c) is given as “chiasma; alleles”.

Alleles are responsible for any particular trait in any organism and chiasma is the site where chromosomes come in contact with each other during crossing over. Hence, it is a wrong answer.

Option (d) is given as “trait and hybrids”.

Traits are the characters carried by any individual, and hybrids contain two alleles for the same trait. Hence, it is a wrong answer.

Hence, options (b), (c), and (d) are incorrect.

Conclusion

Locus provides a physical position to a gene on the chromosome, whereas alleles are the different form of a particular gene.

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