Question

Assertion :In a diploid organism only dorminant mutations will show their effect immediately, recessive mutations do not influence the traits immediately. Reason: The recessive mutants accumulate in gene pool and once the recessive mutations has established homozygous state it is exposed to natural selection.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Diploid organisms have two sets of chromosomes. The dominant mutations are expressed in both heterozygous and homozygous state of the diploid organism but the recessive mutation can be expressed only in the homozygous state. The reason is that it is masked by the presence of dominant wild allele. These recessive mutants accumulate in gene pool but do not show. Once the recessive mutations have established homozygous state it is expressed and is under natural selection. Hence, the correct answer is option A.