Question

In complete dominance, an F1 heterozygote has a phenotype that is

a. completely like the dominant allele

b. completely like the recessive allele

c. intermediate between the parents

d. none of the above

Answer 1

Answer :- "a" i.e Completely like the dominant allele.

Explanation :- The two genes controlling a character are called alleles , one allele expresses its character in the F1 generation. It is the dominant allele. I.e when the dominant allele completely masks the expression of recessive allele , the dominance is called complete dominance.

In complete dominance , the phenotype of the heterozygote is always like that of homozygous dominant parent. The monohybrid ratio is always 3:1. E.g. F1 tall plant of Mendel's monohybrid experiment.

P:. Tall. ×. Dwarf

TT. ×. tt

Gamete: T. t

F1. Tt (Tall)

So from the above experiment we clearly see that in F1 heterozygote the phenotype is like of dominant parent i.e tall.

So from the above discussion we can conclude that the answer is option "a".