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The following question based on genetics, evolution of life & ecological biodiversity topic of general science mcq

Questions : The kind of evolution in which two species of different geneology come to resemble one another closely, is termed as

(a) convergent evolution

(b) parallel evolution

(c) progressive evolution

(d) retrogressive evolution

The correct answers to the above question in:

Answer: (a)

Progressive evolution is the development of organisms with more elaborate and specialized structures from those having less elaborate features e.g. amphibians from reptiles.

Retrogressive or degenerative evolution is the development of simpler forms from more complex ones. Such evolution has occurred in the case of vestigial organs, parasitic forms, and in the reduction of overspecialized structures such as wings in flightless birds.

Parallel evolution is the formation of similar traits in related groups of organisms independently due to similar requirements e.g. running of two-toed deer and one toed horse.

The evolution of wings in insects and birds serve as an example of convergent evolution.

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Read more genetics evolution of life and ecological biodiversity Based General Science Questions and Answers

Question : 1

Which of the following animal is not a insect ?

a) Beetle

b) Ticks

c) Honey bee

d) Wasp

Answer: (b)

Question : 2

With reference to soil conservation, consider the following practices :

  1. Crop rotation
  2. Sand fences
  3. Terracing
  4. Wind breaks
Which of the above are considered appropriate methods for soil conservation in India.

a) 1, 3 and 4 only

b) 1, 2, and 3 only

c) 2 and 4 only

d) 1, 2, 3 and 4

Answer: (d)

Question : 3

Nucleotide arrangement in DNA can be seen by

a) Electron microscope

b) Ultracentrifuge

c) X-ray crystallography

d) Light microscope

Answer: (c)

In 1953 Wilkins obtained very fine X-ray crystallographic pictures of DNA from which Watson and Crick developed the double helix model of DNA.

Question : 4

Consider the following statements :

  1. The terms ‘gene’ and ‘allele’ were coined by Johansen.
  2. Chromosomal theory of inheritance was given by Sutton and Boveri.
  3. ‘One gene-one enzyme’ hypothesis was given by ‘Beadle and Tautum’.
Which of the statements given above are correct?

a) 1 and 2

b) 2 and 3

c) 1, 2 and 3

d) None

Answer: (c)

The Boveri–Sutton chromosome theory or Chromosomal theory of inheritance is a fundamental unifying theory of genetics which identifies chromosomes as carriers of genetic material.

One gene one protein hypothesis was given by Beadle and Tatum which was later outdated after the discovery of alternate splicing.

Question : 5

One of the following is a very unique feature of the mammalian body

a) Rib cage

b) Presence of diaphragm

c) Four chambered heart

d) Homeothermy

Answer: (b)

Question : 6

Which of the following is the X-linked genetic disease?

a) Martin-Bell syndrome

b) Daltonism or colour blindness

c) Duchenne’s muscular dystrophy

d) Both (a) and (b)

Answer: (d)

Colour blindness is the most common sex-linked genetic disorder, which is also expressed in recessive conditions.

Duchenne’s Muscular Dystrophy is caused by the “Dystrophin” gene which is the longest gene with 24,000 kbp in the human genome.

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