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Evolution · Question 117

AIPMT 2001MCQMedium📈 Topic in 50% papers+4−1
1

Forthcoming generations are less adaptive than their parental generation due to

  1. Genetic drift
  2. Natural selection
  3. Mutation
  4. Adaptation

Answer

(3) Mutation

Solution

Most new mutations are random and harmful; they disturb the well-adjusted gene combinations of the parents.

⇒ Offspring carrying such harmful mutations are less adapted to the environment than their parents.

Natural selection and adaptation increase fitness, so they cannot make the next generation less adaptive.

∴ Forthcoming generations become less adaptive due to mutation.

Answer: (3)

AIPMT 2001

Keep practising — Evolution

2

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
3

Darwin's theory of pangenesis shows similarity with theory of inheritance of acquired characters then what shall be correct according to it

  1. There should be some physical basis of inheritance
  2. Size of organs increase with aging
  3. Useful organs become strong and developed while useless organs become extinct. These organs help in struggle for survival
  4. Development of organs is due to will power
AIPMT 2001
4

In Lederberg's replica plating experiment, what shall be used to obtain a streptomycin-resistant strain?

  1. Only minimal medium
  2. Complete medium and streptomycin
  3. Only complete medium
  4. Minimal medium and streptomycin
AIPMT 2001
5

Which is not a vestigial organ in man?

  1. Segmental muscles of abdomen
  2. Third molar
  3. Coccyx
  4. Nails
AIPMT 2000
6

Homo sapiens have evolved in

  1. Pleistocene
  2. Paleocene
  3. Oligocene
  4. Holocene
AIPMT 2000
7

Character which is closely related to human evolution

  1. Reduction in size of jaws
  2. Disappearance of tail
  3. Flat nails
  4. Binocular vision
AIPMT 2000
8

Which evidence of evolution related to Darwin's finches?

  1. Evidences from comparative anatomy
  2. Evidences from embryology
  3. Evidences from biogeographical distribution
  4. Evidences from palaeontological
AIPMT 2000
9

Who is directly related to man?

  1. Gorilla
  2. Orangutan
  3. Gibbon
  4. Rhesus
AIPMT 2000

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