Question

Assertion :Variety of fruit colours in Cucurbita pepo is result of recessive epistasis. Reason: In recessive epistatsis, a recessive gene at one locus enhance the expression of another gene, at a different locus.

• 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 D Both Assertion and Reason are incorrect

Epistasis is the condition in which two or more gene loci are present over a site. This means that two or more genes control a single phenotype. In Cucurbita, there are 2 genes for flower color. One is the dominant yellow gene and the other is the recessive green gene. Dominant epistasis means only one allele of the gene showing epistasis can ask the effects of other genes. Recessive epistasis is where 2 alleles should be inherited for the phenotype to be masked. So, this is a case of the dominant phenotype.

So, none of the given statements, assertions or reason, are correct.