Principles of Inheritance and Variation

This is an MCQ-based quiz on Principles of Inheritance and Variation.

This includes Epistasis, Dominant, Co-dominant, Recessive Oncogenic Trait, Monogenic trait, and Polygenic trait

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Distance between the genes and advantage of recombination shows:

a direct relationship an inverse relationship a parallel relationship no relationship.

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:

Autosomal dominant Autosomal recessive Sex-linked dominant Sex-linked recessive.

In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?

GGG AAG GAA GUG.

All genes located on the same chromosome:

Form different groups depending upon their relative distance

Form one linkage group

Will not form any linkage groups

Form interactive groups that affect the phenotype

Sucess of mendal is

Selection of Peaplant Studied of free characters More Characters selection Pea is Bisexual

Loss of Melanin pigment cause for:

Colourblindness Depigmentation Phenyl Ketoneuria Alkaptoneuria

Gunetical identification of male human is:

By Nucleus By cells By Autosome By Sex-chromosome

Cause of chromosomal mutation:

Euploidy Polyploidy Physical effect All of these

From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb will be obtained in the ratio

1:1:2 1:2:1 2:1:1 2:1:2

When ‘Aa’ is crossed with ‘aa’, (A is dominant over a)

All the offspring will have dominant phenotype.

All the offspring will have recessive phenotype.

50% of offspring will have dominant phenotype and 50% will have recessive phenotype.

75% of offspring will have dominant phenotype and 50% will have recessive phenotype.

A woman with normal vision has a colorblind father. She marries a colourblind man. What proportion of their children will be colourblind?

0% 25% 50% 100%

The possibility of all genotypes of offspring in a genetic cross is calculated by a graphical representation which was developed by

Komberg T.H. Morgan Gregor Mendel Reginald Punnett

Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group respectively. What would be the genotype of both mother and father?

Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’. Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’. Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively. Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively.

Conditions of a karyotype 2n ± 1 and 2n ± 2 are called

Aneuploidy

Polyploidy

Allopolyploidy

Monosomy

Distance between the genes and percentage of recombination shows

An inverse relationship

A parallel relationship

No relationship

A direct relationship

In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

The two genes are linked and present on the same chromosome.