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Evolution · Question 96

AIPMT 2003MCQMedium📈 Topic in 50% papers+4−1
1

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

Answer

(2) Interbreeding within this population

Solution

As per NCERT, genetic drift is a change in allele frequency by chance; it is most marked in small, isolated populations.

⇒ When a small population is isolated and its members interbreed only among themselves (no gene flow from outside), chance alone decides which alleles pass to the next generation.

∴ Some alleles get fixed and others are lost randomly — random genetic drift. A large population size or high variability works against drift.

Answer: (2)

AIPMT 2003

Keep practising — Evolution

2

Industrial melanism is an example of :-

  1. Darkening of skin due to smoke from industries
  2. Defensive adaptation of skin against ultraviolet radiations
  3. Drug resistance
  4. Protective resemblance with the surroundings
AIPMT 2003
3

In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner :-

  1. Selection
  2. Random drift
  3. Mutations
  4. Migration
AIPMT 2003
4

Darwin in his 'Natural Selection Theory' did not believe in any role of which one of the following in organic evolution ?

  1. Survival of the fittest
  2. Parasites and predators as natural enemies
  3. Discontinuous variations
  4. Struggle for existence
AIPMT 2003
5

Which one of the following describes correctly the homologous structures ?

  1. Organs with anatomical dissimilarities but performing same function
  2. Organs that have no function now, but had an important function in ancestors
  3. Organs with anatomical similarities, but performing different functions
  4. Organs appearing only in embryonic stage and disappearing later in the adult
AIPMT 2003
6

In recent years, DNA sequences (nucleotide sequence) of mt-DNA and Y chromosomes were considered for the study of human evolution, because :-

  1. They are uniparental in origin and do not take part in recombination
  2. They can be studied from the samples of fossil remains
  3. Their structure is known in greater detail
  4. They are small, and therefore, easy to study
AIPMT 2003
7

Some bacteria are able to grow in streptomycin containing medium due to

  1. natural selection
  2. induced mutation
  3. reproductive isolation
  4. genetic drift.
AIPMT 2002
8

Which of the following is important for speciation ?

  1. Behavioural isolation
  2. Seasonal isolation
  3. Tropical isolation
  4. Reproductive isolation
AIPMT 2002
9

Which of the following are homologous organs ?

  1. Wings of birds & Pectoral fins of fish
  2. Wings of bat & Butterfly
  3. Legs of frog & Cockroach
  4. Wings of birds & Locust
AIPMT 2002
10

Genetic drift operates in : -

  1. Slow reproductive population
  2. Small isolated population
  3. Large isolated population
  4. Fast reproductive population
AIPMT 2002
11

There is no life on moon due to the absence of -

  1. O2
  2. Light
  3. Water
  4. Temperature
AIPMT 2002

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