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Evolution · Question 34

NEET (UG) 2019MCQEasy📈 Topic in 50% papers+4−1
1

In a species, the weight of newborn ranges from 2 to 5 kg. 97\% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99\% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

  1. Disruptive Selection
  2. Cyclical Selection
  3. Directional Selection
  4. Stabilizing Selection

Answer

(4) Stabilizing Selection

Solution

Individuals with the average (mean) weight survive, while both extremes (very light and very heavy newborns) are eliminated.

As per NCERT, in stabilisation more individuals acquire the mean character value; in directional change more individuals acquire a value other than the mean, and in disruption more individuals acquire peripheral character values at both ends.

Selection favouring the mean and removing both extremes is stabilizing selection.

Answer: (4)

NEET (UG) 2019

Keep practising — Evolution

2

The similarity of bone structure in the forelimbs of many vertebrates is an example of

  1. homology
  2. analogy
  3. convergent evolution
  4. adaptive radiation
NEET 2018
3

Among the following sets of examples for divergent evolution, select the incorrect option.

  1. Forelimbs of man, bat and cheetah
  2. Heart of bat, man and cheetah
  3. Brain of bat, man and cheetah
  4. Eye of octopus, bat and man
NEET 2018
4

According to Hugo de Vries, the mechanism of evolution is

  1. multiple step mutations
  2. saltation
  3. phenotypic variations
  4. minor mutations
NEET 2018
5

Artificial selection to obtain cows yielding higher milk output represents :

  1. directional as it pushes the mean of the character in one direction
  2. stabilizing followed by disruptive as it stabilizes the population to produce higher yielding cows.
  3. disruptive as it splits the population into two, one yielding higher output and the other lower output.
  4. stabilizing selection as it stabilizes this character in the population.
Out of syllabusNEET 2017
6

Which of the following structures is homologous to the wing of a bird ?

  1. Wing of a Moth
  2. Dorsal fin of a Shark
  3. Flipper of Whale
  4. Hindlimb of Rabbit
NEET 2016 (Phase 1)
7

Analogous structures are a result of :

  1. Divergent evolution
  2. Convergent evolution
  3. Stabilizing selection
  4. Shared ancestry
NEET 2016 (Phase 1)
8

Following are the two statements regarding the origin of life - Of the above statements which one of the following options is correct ?

  1. Both A and B are false
  2. Both A and B are correct
  3. B is correct but A is false
  4. A is correct but B is false
NEET 2016 (Phase 1)
9

Genetic drift operates in

  1. slow reproductive population
  2. large isolated population
  3. non-reproductive population
  4. small isolated population
NEET 2016 (Phase 2)
10

In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by

  1. pq
  2. p2
  3. 2pq
  4. q2
NEET 2016 (Phase 2)
11

The chronological order of human evolution from early to the recent is

  1. Ramapithecus Homo habilis Australopithecus Homo erectus
  2. Australopithecus Ramapithecus Homo habilis Homo erectus
  3. Ramapithecus Australopithecus Homo habilis Homo erectus
  4. Australopithecus Homo habilis Ramapithecus Homo erectus
NEET 2016 (Phase 2)

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All NEET Zoology chapters
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Class 12Human ReproductionReproductive HealthEvolutionHuman Health and DiseaseBiotechnology: Principles and ProcessesBiotechnology and its ApplicationsBiology Experimental Skills