Class 12 Biology - Chapter 5: Principles of Inheritance and Variation MCQ Questions

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Question 1

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

A Sex-linked recessive.

B Sex-linked dominant

C Autosomal recessive

D Autosomal dominant

Question 2

Distance between the genes and advantage of recombination shows:

A no relationship.

B a parallel relationship

C an inverse relationship

D a direct relationship

Question 3

Mother and father of a person with â€˜Oâ€™ blood group have â€˜Aâ€™ and â€˜Bâ€™ blood groups, respectively. What would be the genotype of both mother and father ?

A Both mother and father are homozygous for â€˜Aâ€™ and â€˜Bâ€™ blood group, respectively.

B Both mother and father are heterozygous for â€˜Aâ€™ and â€˜Bâ€™ blood group, respectively.

C Mother is heterozygous for â€˜Aâ€™ blood group and father is homozygous for â€˜Bâ€™.

D Mother is homozygous for â€˜Aâ€™ blood group and father is heterozygous for â€˜ Bâ€™.

Question 4

Which of the following will not result in variations among siblings?

A Mutation.

B Linkage

C Crossing over

D Independent assortment of genes

Question 5

A cross between two tall plants resulted in offspring having a few dwarf plants. What would be the genotypes of both the parents?

A Tt and tt.

B TT and TT

C Tt and Tt

D TT and Tt

Question 6

In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that:

A The alleles of two genes are segregating independently.

B It is a case of multiple alleles m

C It is a multigenic inheritance

D The alleles of two genes are interacting with each other

Question 7

Two genes â€˜Aâ€™ and â€˜Bâ€™ are linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation ?

A 1 : 1.

B 3 : 1

C 9 : 3 : 3 : 1

D 1 : 1 : 1 : 1

Question 8

It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the :

A cross-pollination of parental generations.

B self-pollination of F₁ offsprings

C observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.

D results of F₃ generation of a cross.

Question 9

Mendelâ€™s law of independent assortment holds good for genes situated on the :

A same chromosome.

B extra nuclear genetic element

C homologous chromosomes

D non-homologous chromosomes

Question 10

All genes located on the same chromosome:

A form interactive groups that affect the phenotype

B will not form any linkage groups

C form one linkage group

D form different groups depending upon their relative distance

Question 11

Person having genotype l^A l^B would show the blood group as AB. This is because of:

A Incomplete dominance.

B Segregation

C Co-dominance

D Pleiotropy

Question 12

Occasionally, a single gene may express more than one effect. The phenomenon is called :

A polygeny.

B pleiotropy

C mosaicism

D multiple allelism

Question 13

In the F₂ generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are :

A Phenotypes -4; genotypes -9.

B Phenotypes -4; genotypes -8

C Phenotypes -9; genotypes -4

D Phenotypes -4; genotypes -16

Question 14

ZZ / ZW type of sex determination is seen in :

A Peacock.

B Cockroach

C Snails

D Platypus

Question 15

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:

A all females.

B all males

C females and males, respectively

D males and females, respectively

Question 16

Conditions of a karyotype 2n + 1 and 2n Â± 2 are called:

A Monosomy.

B Allopolyploidy

C Polyploidy

D Aneuploidy

Question 17

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :

A maternal trait.

B polygenic trait

C Mendelian trait

D quantitative trait

Question 18

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

A GUG.

B GAA

C AAG

D GGG

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Class 12 Biology - Chapter 5: Principles of Inheritance and Variation MCQ Questions

Your Class 12 Biology Study Path

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

Distance between the genes and advantage of recombination shows:

Mother and father of a person with â€˜Oâ€™ blood group have â€˜Aâ€™ and â€˜Bâ€™ blood groups, respectively. What would be the genotype of both mother and father ?

Which of the following will not result in variations among siblings?

A cross between two tall plants resulted in offspring having a few dwarf plants. What would be the genotypes of both the parents?

In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that:

Two genes â€˜Aâ€™ and â€˜Bâ€™ are linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation ?

It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the :

Mendelâ€™s law of independent assortment holds good for genes situated on the :

All genes located on the same chromosome:

Person having genotype l^A l^B would show the blood group as AB. This is because of:

Occasionally, a single gene may express more than one effect. The phenomenon is called :

In the F₂ generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are :

ZZ / ZW type of sex determination is seen in :

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:

Conditions of a karyotype 2n + 1 and 2n Â± 2 are called:

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :

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

Practice Complete!

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Class 12 Biology - Chapter 5: Principles of Inheritance and Variation MCQ Questions

Your Class 12 Biology Study Path

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

Distance between the genes and advantage of recombination shows:

Mother and father of a person with â€˜Oâ€™ blood group have â€˜Aâ€™ and â€˜Bâ€™ blood groups, respectively. What would be the genotype of both mother and father ?

Which of the following will not result in variations among siblings?

A cross between two tall plants resulted in offspring having a few dwarf plants. What would be the genotypes of both the parents?

In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that:

Two genes â€˜Aâ€™ and â€˜Bâ€™ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation ?

It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the :

Mendelâ€™s law of independent assortment holds good for genes situated on the :

All genes located on the same chromosome:

Person having genotype lA lB would show the blood group as AB. This is because of:

Occasionally, a single gene may express more than one effect. The phenomenon is called :

In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are :

ZZ / ZW type of sex determination is seen in :

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:

Conditions of a karyotype 2n + 1 and 2n Â± 2 are called:

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :

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

Practice Complete!

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Percentage Calculator

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Quick Links

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What Students Are Viewing

Two genes â€˜Aâ€™ and â€˜Bâ€™ are linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation ?

Person having genotype l^A l^B would show the blood group as AB. This is because of:

In the F₂ generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are :