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MCQ Questions Class 12 Principles of Inheritance and Variation with Answers - Set - 2
Question 1:
Round seed is dominant over wrinkled seeds in Pea. If homozygous, round seeded Pea plants are crossed with wrinkled seeded plants, the offsprings will be
a) All round
b) All wrinkled
b) 75% round and 25% wrinkled
d) 50% round and 50% wrinkled
Correct Answer – (D)
Question 2:
A holandric gene cause hypertrichosis.When a man with hypertrichosis marries a normal women, what percentage of their daughters would be expected to have hypertrichosis?
a) 50%
b) 25%
c) 75%
d) 0%
Correct Answer – (D)
Question 3:
The genotypes of a husband and wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?
(a) 3 genotypes; 4 phenotypes
(b) 4 genotypes; 3 phenotypes
(c) 4 genotypes; 4 phenotypes
(d) 3 genotypes; 3 phenotypes
Correct Answer – (B)
Question 4:
Independent assortment of genes does not take place when
(a) genes are located on homologous chromosomes
(b) genes are linked and located on same chromosome
(c) genes are located on non-homogenous chromosome
(d) all of these.
Correct Answer – (B)
Question 5:
Of a normal couple, half the sons are haemophiliac while half the daughters are carriers. The gene is located on
(a) X-chromosome of father
(b) Y-chromosome of father
(c) one X-chromosome of mother
(d) both the X-chromosomes of mother.
Correct Answer – (C)
MCQ Questions Class 12 Principles of Inheritance and Variation With Answers
Question 6:
A phenomenon of a single gene regulating several phenotypes is called
a) Multiple allelism
b) Pleiotropy
c) Incomplete dominance
d) Co-dominance
Correct Answer – (B)
Question 7:
A male human is heterozygous for autosomal genes A and B and is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh?
(a) 1/8
(b) 1/32
(c) 1/16
(d) 1/4
Correct Answer – (A)
Question 8:
Which contribute to the success of Mendel?
(a) Qualitative analysis of data
(b) Observation of distinct inherited traits
(c) His knowledge of biology
(d) Consideration of one character at one time
Correct Answer – (D)
Question 9:
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?
(a) Seven
(b) Six
(c) Five
(d) Four
Correct Answer – (D)
Question 10:
Among the following characters, which one was not considered by Mendel in his experiments on pea?
(a) Trichomes-Glandular or non-glandular
(b) Seed-Green or yellow
(c) Pod-Inflated or constricted
(d) Stem-Tall or dwarf
Correct Answer – (A)
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