CBSE Class 12 Principles of Inheritance and Variation Multiple Choice Questions with Answers. MCQ Questions Class 12 Principles of Inheritance and Variation with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT MCQ questions Class 12 Principles of Inheritance and Variation with Answers to know their preparation level.
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MCQ Questions Class 12 Principles of Inheritance and Variation with Answers - Set - 5
Question 1:
When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called
(a) heterosis
(b) transformation
(c) splicing
(d) metamorphosis
Correct Answer – (A)
Question 2:
A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
(a) AaBB
(b) AABb
(c) AABB
(d) AaBb
Correct Answer – (D)
Question 3:
In human beings 45 chromosomes/single X/XO abnormality causes
(a) Down’s syndrome
(b) Kinefelter’s syndrome
(c) Turner’s syndrome
(d) Edward’s syndrome
Correct Answer – (C)
Question 4:
A child’s blood group is ‘O’. The parent’s blood groups cannot be
(a) A and B
(b) A and A
(c) AB and O
(d) B and O
Correct Answer – (C)
Question 5:
Test cross involves
(a) crossing between two genotypes with dominant trait
(b) crossing between two genotypes with recessive trait
(c) crossing between two F1 hybrids
(d) crossing the F1 hybrid with a double recessive genotype
Correct Answer – (D)
MCQ Questions Class 12 Principles of Inheritance and Variation With Answers
Question 6:
In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates
(a) the two genes are linked and present on the same chromosome
(b) both of the characters are controlled by more than one gene
(c) the two genes are located on two different chromosomes
(d) chromosomes failed to separate during meiosis
Correct Answer – (A)
Question 7:
tt mates with Tt. What will be characteristic of offspring?
(a) 75% recessive
(b) 50% recessive
(c) 25% recessive
(d) All dominant
Correct Answer – (B)
Question 8:
An organism with two identical alleles is
(a) dominant
(b) hybrid
(c) heterozygous
(d) homozygous
Correct Answer – (D)
Question 9:
In hybridisation, Tt × tt gives rise to the progeny of ratio
(a) 2 : 1
(b) 1 : 2 : 1
(c) 1 : 1
(d) 1 : 2.
Correct Answer – (C)
Question 10:
An abnormal human male phenotype involving an extra X-chromosome (XXY) is a case of
(a) Edward’s syndrome
(b) Klinefelter’s syndrome
(c) intersex
(d) Down’s syndrome
Correct Answer – (B)
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