Principles of Inheritance and Variation MCQ Questions & Answers in Botany

11. Point mutation involves:

A change in single base pair

B duplication

C deletion

D insertion

Discuss Question

12. Which of the following was absent in the atmosphere of primitive earth

A CH₄

B NH₃

C H₂O

D None of the above

Discuss Question

13. Incomplete dominance occurs in

A Mirabilis

B Antirrhinum

C Andulasion fowl

D All of the above

Discuss Question

14. Which of the following undergoes change in mutation

A Chromosome

B Structure of gene

C Sequence of gene

D Any of the above

Discuss Question

15. Heterozygous tall plants were crossed with dwarf plants, what will be the ratio of dwarf plants in the progeny

A 50%

B 25%

C 75%

D 100%

Discuss Question

16. Mutations which alter nucleotide sequence whitin a gene are

A Frame shift mutations

B Base pair substitutions

C A and B both

D None of the above

Discuss Question

17. Down's syndrome in humans is due to

A Two $$'Y'$$ chromosomes

B Three $$'X'$$ chromosomes

C Three copies of chromosome 21

D Monosomy

Discuss Question

18. Grain colour in wheat is determined by three pairs of polygenes. Following cross AABBCC (dark colour) x aabbcc (light colour), in F2 generation what proportion of the progeny is likely to resemble either parent

A None

B Less than 5 per cent

C One third

D Half

Discuss Question

19. Mutation theory was proposed by

A Hugo De Vries

B J. G. Mendel

C Lamarck

D Kolreuter

Discuss Question

20. Haploids are able to express both recessive and dominant alleles/mutations because there are

A many alleles for each gene

B two alleles for each gene

C only one allele for each gene in the individual

D only one allele in a gene

Discuss Question

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

11. Point mutation involves:

12. Which of the following was absent in the atmosphere of primitive earth

13. Incomplete dominance occurs in

14. Which of the following undergoes change in mutation

15. Heterozygous tall plants were crossed with dwarf plants, what will be the ratio of dwarf plants in the progeny

16. Mutations which alter nucleotide sequence whitin a gene are

17. Down's syndrome in humans is due to

18. Grain colour in wheat is determined by three pairs of polygenes. Following cross AABBCC (dark colour) x aabbcc (light colour), in F2 generation what proportion of the progeny is likely to resemble either parent

19. Mutation theory was proposed by

20. Haploids are able to express both recessive and dominant alleles/mutations because there are

Practice More MCQ Question on Biology Section