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Evolution · Question 86

AIPMT 2005MCQEasy📈 Topic in 50% papers+4−1
1

At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

  1. 0.48
  2. 0.24
  3. 0.36
  4. 0.16

Answer

(1) 0.48

Solution

As per NCERT, Hardy–Weinberg equilibrium: p2 + 2pq + q2 = 1, where 2pq is the frequency of heterozygotes.

⇒ p = 0.6, q = 0.4

⇒ 2pq = 2 0.6 0.4

= 0.48

∴ Frequency of heterozygotes (Aa) = 0.48

Answer: (1)

AIPMT 2005

Keep practising — Evolution

2

Which of the following is not true for a species ?

  1. Variations occur among members of a species
  2. Gene flow does not occur between the populations of a species
  3. Each species is reproductively isolated from every other species
  4. Members of a species can interbreed
AIPMT 2005
3

Diversification in plant life appeared

  1. due to long periods of evolutionary changes
  2. due to abrupt mutations
  3. suddenly on earth
  4. by seed dispersal
AIPMT 2004
4

Presence of gills in the tadpole of frog indicates that

  1. fish were amphibious in the past
  2. fish evolved from frog-like ancestors
  3. frog will have gills in future
  4. frog evolved from gilled ancestors
AIPMT 2004
5

Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms include -

  1. Electron spin resonance (ESR) & fossil DNA
  2. Study of carbohydrates/proteins in fossils
  3. Study of the conditions of fossilization
  4. Study of carbohydrates/proteins in rocks
AIPMT 2004
6

What kind of evidence suggested that man is more closely related with chimpanzee than with other hominoid apes ?

  1. Evidence from fossil remains and the fossil mitochondrial DNA alone
  2. Evidence from DNA extracted from sex chromosomes, autosomes
  3. Comparison of chromosome morphology only
  4. Evidence from DNA from sex chromosomes only
AIPMT 2004
7

According to Oparin, which one of the following was not present in the primitive atmosphere of the earth ?

  1. Water vapour
  2. Oxygen
  3. Methane
  4. Hydrogen
AIPMT 2004
8

Diversification in plant life appeared

  1. By seed dispersal
  2. Due to abrupt mutations
  3. Due to long periods of evolutionary changes
  4. Suddenly on earth
AIPMT 2004
9

Convergent evolution is illustrated by:

  1. Bacterium and protozoan
  2. Rat and dog
  3. Dogfish and whale
  4. Starfish and cuttle fish
AIPMT 2003
10

Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?

  1. Variations, natural selection, overproduction, constancy of population size
  2. Overproduction, constancy of population size, variations, natural selection
  3. Variations, constancy of population size, overproduction, natural selection
  4. Overproduction, variations, constancy of population size, natural selection
AIPMT 2003
11

Random genetic drift in a population probably results from

  1. Constant low mutation rate
  2. Interbreeding within this population
  3. Large population size
  4. Highly genetically variable individuals
AIPMT 2003

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