GPB MCQ Quiz 160 for ICAR JRF/SRF/ARS Exam Preparation

The phenomenon where a gene having more than one phenotypic effect is called

A) Pleiotropism

B) Pleiotropy

C) Both

D) None of the above

Explanation: Pleiotropy (sometimes called pleiotropism) refers to one gene controlling multiple phenotypic traits.

The gene interaction where two dominant alleles have similar effect when they are separate, but produce enhanced effect when they come together is called

A) Polymeric gene interaction

B) Pleiotropic gene interaction

C) None

D) Both

Explanation: Polymeric gene interaction occurs when two dominant alleles together enhance the effect beyond their individual actions.

When a dominant allele at either of two loci can mask the expression of recessive alleles at the two loci, it is known as

A) Dominant epistasis

B) Duplicate dominant epistasis

C) Recessive epistasis

D) None of above

Explanation: Duplicate dominant epistasis occurs when a dominant allele at either locus can mask the effect of recessives at both loci.

When a dominant allele at one locus can mask the expression of both alleles at another locus, it is known as

A) Dominant epistasis

B) Recessive epistasis

C) Duplicate epistasis

D) None of the above

Explanation: In dominant epistasis, a dominant allele at one locus suppresses the phenotypic expression of alleles at another locus.

A cross between two genotypes in which the order of male and female is reversed is called

A) Reciprocal cross

B) Back cross

C) Direct cross

D) Test cross

Explanation: Reciprocal cross involves two crosses where the sexes of the parents are reversed to study inheritance patterns.

Both alleles express their phenotypes in heterozygote is

A) Codominance

B) Incomplete dominance

C) Dominance

D) None

Explanation: In codominance, both alleles are equally expressed in the heterozygous condition (e.g., ABO blood groups).

Polyploids which develop from an auto polyploidy species is

A) Autohaploid

B) Aneuhaploid

C) Dihaploid

D) None

Explanation: Dihaploids are polyploids that arise from autopolyploid species.

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