
Concept explainers
Introduction:
An organism’s genotype is the number of different alleles for a particular trait present in it, whereas

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.
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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Chapter 11 Solutions
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