Question

Assertion :Antirrhinum is a good example to understand incomplete dominance. Reason: Heterozygotes show characteristics of both the alleles.

• 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 C Assertion is correct but Reason is incorrect.

Incomplete dominance refers to the conditions where none of the factors of a gene is dominant; the phenotype of a heterozygous dominant individual is a blend of dominant and recessive traits. Flower color in Antirrhinum follows incomplete dominance. A red allele is incompletely dominant over white colour allele; thus “RR” genotype produce red flowers while “rr” gives white flowers but “Rr” produce less half the pigment than “RR” genotypes and gives pink flowers. Heterozygote produces blend of the dominant and recessive allele; it does not exhibit characters of both alleles which is the case in codominance. Thus, the correct answer is option C.