Principles of Inheritance and Variation Easy Questions and Answers

Principles of Inheritance and Variation

A polygenic inheritance in human beings is

Polygenic inheritance show cumulative effect i.e. two independent dominant genes produce additive effect on an individual.

Correct Option: A

Polygenic inheritance show cumulative effect i.e. two independent dominant genes produce additive effect on an individual.

A gene pair hides the effect of another. The phenomenon is

Epistasis is the phenomenon of masking or supressing the phenotypic impression of a gene pair by a non allelic gene pair which impresses its own effect.

Correct Option: A

Epistasis is the phenomenon of masking or supressing the phenotypic impression of a gene pair by a non allelic gene pair which impresses its own effect.

A child of O-group has B-group father. The genotype of father will be

The genotype of the child would be IºIº (recessive). Hence the genotype of the father can only be IBIO.

Correct Option: D

The genotype of the child would be IºIº (recessive). Hence the genotype of the father can only be IBIO.

An allele is dominant if it is expressed in

Dominant alleles expresses itself in the homozygous as well as heterozygous condition. It is denoted by capital letter.

Correct Option: A

Dominant alleles expresses itself in the homozygous as well as heterozygous condition. It is denoted by capital letter.

Nicotiana sylvestris flowers only during long days and N. tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self – fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species?

Similar species show interbreeding characters, i.e., two organisms which breed freely in nature to produce fertile offsprings belong to the same species. The two species are considered separate because they are reproductively distinct.