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Evolution · Question 108

AIPMT 2002MCQEasy📈 Topic in 50% papers+4−1
1

In which condition, the gene ratio remains constant for any species population ?

  1. Gene flow
  2. Mutation
  3. Sexual selection
  4. Random mating

Answer

(4) Random mating

Solution

As per NCERT, allele frequencies in a population are stable and constant from generation to generation (Hardy–Weinberg equilibrium), p2 + 2pq + q2 = 1.

∵ Gene migration (gene flow), genetic drift, mutation, genetic recombination and natural (including sexual) selection disturb this equilibrium.

⇒ Equilibrium needs a large population with random mating and no such disturbing factor.

∴ The gene ratio remains constant under random mating.

Answer: (4)

AIPMT 2002

Keep practising — Evolution

2

Sequence of which of the following is used to know the phylogeny ?

  1. DNA
  2. r-RNA
  3. m-RNA
  4. t-RNA
AIPMT 2002
3

In which era reptiles were dominant ?

  1. Archaeozoic era
  2. Mesozoic era
  3. Coenozoic era
  4. Paleozoic era
AIPMT 2002
4

Half life period of C14 is : -

  1. 5000 years
  2. 50 years
  3. 500 years
  4. 5 104 years
AIPMT 2001
5

Similarities in organism with different genotype indicates : -

  1. Divergent evolution
  2. Macroevolution
  3. Convergent evolution
  4. Microevolution
AIPMT 2001
6

Reason of diversity in living beings : -

  1. Mutation
  2. Short term evolutionary change
  3. Long term evolutionary change
  4. Gradual change
AIPMT 2001
7

Which of the following is closest relative of man ?

  1. Gorilla
  2. Chimpanzee
  3. Gibbon
  4. Orangutan
AIPMT 2001
8

Which of the following is correct order of the evolutionary history of man ?

  1. Peking man, Heidelberg man, Neanderthal man, Cro-Magnon man
  2. Peking man, Neanderthal man, Homo sapiens, Cro-Magnon man
  3. Peking man, Neanderthal man, Homo sapiens, Heidelberg man
  4. Peking man, Homo sapiens, Neanderthal man, Cro-Magnon man
AIPMT 2001
9

First life on earth was : -

  1. Autotrophs
  2. Photoautotrophs
  3. Cyanobacteria
  4. Chemoheterotrophs
AIPMT 2001
10

Forthcoming generations are less adaptive than their parental generation due to

  1. Genetic drift
  2. Natural selection
  3. Mutation
  4. Adaptation
AIPMT 2001
11

Occurrence of endemic species in South America and Australia is due to

  1. There is no terrestrial route to these places
  2. Retrogressive evolution
  3. These species have become extinct from other regions
  4. Continental separation
AIPMT 2001

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