Evolution

Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?

1. B, C and D only
2. A only
3. A and C only
4. D only

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

1. 0.16 (AA); 0.48 (Aa); 0.36 (aa)
2. 0.16 (AA); 0.36 (Aa); 0.48 (aa)
3. 0.36 (AA); 0.48 (Aa); 0.16 (aa)
4. 0.16 (AA); 0.24 (Aa); 0.36 (aa)

Variations caused by mutation, as proposed by Hugo de Vries, are :

1. small and directional
2. small and directionless
3. random and directional
4. random and directionless

Match the hominids with their correct brain size : Select the correct option.

1. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
4. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

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

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

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

According to Hugo de Vries, the mechanism of evolution is

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

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.

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