GPB MCQ Quiz 167 for ICAR JRF/SRF/ARS Exam Preparation

The type of dominance where phenotype of heterozygote is more extreme than that of either parent is

A) Complete dominance

B) Incomplete dominance

C) Over dominance

D) Co-dominance

Explanation: Overdominance occurs when the heterozygote phenotype is more extreme or advantageous than either homozygote.

The type of dominance where heterozygous shows the phenotype of both homozygotes or parents rather than expressing an intermediate phenotype is

A) Incomplete dominance

B) Over dominance

C) Complete dominance

D) Co-dominance

Explanation: Co-dominance is where both alleles are fully expressed in the heterozygote, such as AB blood group in humans.

AB blood group in man is an example of parent is

A) Incomplete dominance

B) Over dominance

C) Complete dominance

D) Co-dominance

Explanation: AB blood group shows co-dominance, where both A and B alleles are equally expressed.

Genes those are influenced by other genes or are generally governed by one or more genes with large easily detectable effects are

A) Oligogenes

B) Polygenes

C) Modifying genes

D) None of the above

Explanation: Oligogenes are few in number but have large, easily detectable effects on traits.

The traits determined by oligogenes show distinct classes are known as

A) Polygenic characters

B) Qualitative characters

C) Modifying genes

D) None of the above

Explanation: Qualitative characters show discrete phenotypic classes and are often determined by oligogenes.

Genes those are influenced by the genetic background and by the environment are generally governed by specific genes are called

A) Oligogenes

B) Polygenes

C) Modifying genes

D) None of the above

Explanation: Polygenes are multiple genes that contribute to a trait and are influenced by genetic background and environment.

Polygenic affected characters are called

A) Qualitative characters

B) None of the above

C) Both

D) Quantitative characters

Explanation: Quantitative characters are traits affected by multiple genes (polygenes) and often show continuous variation.

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