51.
The contrasting characters of individuals are represented by unit factors which separate at the time of gamete formation is explained by Meddel's law of:
A. Dominance and Recessiveness
B. Segregation
C. Independent Assortment
D. None of these
Answer: A
Explanation:
52.
In cross between more than one pair of contrasting characters the assortment of unit factors is independent of parental combinations is the theme of:
A. Law of dominance and recessiiveness
B. Law of segregation
C. Law of independent assortment
D. None of these
Answer: C
Explanation:
53.
In Drosophila, red eye character is dominant over white-eye character. When a homozygous red eye individual is crossed with a homozygous white eye individual and individuals of F1 generation are intercrossed, 12 individuals are produced. White-eye individuals of these will be:
Answer: A
Explanation:
54.
On the basis of which of these rations, we can prove law of independent assortment:
A. 9:3:3:1
B. 9:03:04
C. 1:02:01
D. 2:01:01
Answer: A
Explanation:
55.
Which of these is a recessive trait in Drosophila (fruit fly):
A. Red eye colour
B. White eye colour
C. Both (a) & (b)
D. None of these
Answer: A
Explanation:
56.
Skin colour inheritance in mammals is usually:
A. Monogenic
B. Multiple allelism
C. Polygenic
D. Pseudoallelism
Answer: C
Explanation:
57.
A ratio of 3:1 in F2 individuals is suggestive of:
A. Monohybrid cross
B. Dihybrid cross
C. Trihybrid cross
D. None of these
Answer: A
Explanation:
58.
Ratio of 27:9:9:9:3:3:1 in F2 individuals is suggestive of:
A. Monohybrid cross
B. Dihybrid cross
C. Trihybrid cross
D. None of these
Answer: C
Explanation:
59.
Which of these do not follow mendelian ratios:
A. Complementary and supplementary genes
B. Lethal genes and incomplete dominance
C. Modifier genes
D. All of these
Answer: D
Explanation:
60.
Segregation of alleles occurs at the time of:
A. Cleavage
B. Meiosis
C. Fertilization
D. Crossing over
Answer: D
Explanation:
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