Gentics and Evoloution MCQ question and answer with solution

81

The biological species concept of organisms is based on

A) morphological traits B) evolutionary traits C) reproductive isolation D) geographical isolation

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Answer & Solution

Answer: Option C

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82

The process of isolating a desirable homozygous individual from the mixed population and multiplying the same without contamination to release as a new variety is known as

A) Pure-line selection B) Clonal selection C) Mass selection D) Natural selection

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Answer & Solution

Answer: Option A

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83

In Asparagus

A) The maleness is dominant over femaleness and male plants are ordinarily homozygous B) The femaleness is dominant over maleness and the male plants are ordinarily heterozygous C) The femaleness is dominant over maleness and the male plants are ordinarily homozygous D) The maleness is dominant over femaleness and the male plants are ordinarily heterozygous

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Answer & Solution

Answer: Option D

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84

Which of the following is responsible forn controlling hereditary characters of the living cells?

A) Enzyme B) Hormone C) RNA D) DNA

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Answer & Solution

Answer: Option D

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85

Match List-I (Operons) with List-II (Number of structural genes) and select the correct answer:

List-I	List-II
a. Ara Operon of E. coli	1. 9 structural genes
b. His Operon of Salmonella typhimurium	2. 4 structural genes
c. Trp Operon of E. coli	3. 5 structural genes
d. Leu Operon	4. 3 structural genes

A) a-1, b-3, c-4, d-2 B) a-2, b-4, c-1, d-3 C) a-3, b-1, c-4, d-2 D) a-4, b-1, c-3, d-2

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Answer & Solution

Answer: Option D

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86

Study the following statements.
1. In a monohybrid cross, we study two characters.
2. Garden pea (Pisum sativum) reproduces asexually in nature.
3. In incomplete dominance, one gene (dominant) is mixed with the other gene (recessive).
4. Mendel choose seven visible characters, each with two contrasting forms.
Which of the statements given above is are false?

A) 1, 2 and 3 B) 1 and 2 C) 2 and 3 D) 1, 3 and 4

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Answer & Solution

Answer: Option A

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87

A true species in Mauritius failed to reproduce because of the extinction of a fruit eating bird. Which one of the following was that bird?

A) Dove B) Dodo C) Condor D) Skua

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Answer & Solution

Answer: Option B

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88

Point mutation arises due to change in

A) single base of DNA B) single base pair of DNA C) segment of DNA D) double base pair of DNA

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Answer & Solution

Answer: Option A

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89

Organs those which were functional at one time but iater on during the course of evolution lost their function are called

A) Vestigeal organs B) Analogous organs C) Homologous organs D) None of the above

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Answer & Solution

Answer: Option A

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90

Dinosaurs were

A) Cenozoic reptiles B) Mesozoic birds C) Paleozoic amphibians D) Mesozoic reptiles

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Answer & Solution

Answer: Option D

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Gentics and Evoloution MCQ question and answer with solution | Biology Gk MCQs