Evolution

Panspermia, an idea that is still a favourite for some astronomers, means:

1. Transfer of spores as unit of life from other planets to Earth
2. Creation of life from dead and decaying matter
3. Creation of life from chemicals
4. Origin of sperm in human testes

Select the correct statement regarding mutation theory of evolution.

1. Large differences due to mutations arise gradually in a population
2. This theory was proposed by Alfred Wallace
3. Variations are small directional changes
4. Single step large mutation is a cause of speciation

The factor that leads to Founder effect in a population is :

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

Match List-I with List-II. Choose the correct answer from the options given below.

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

Embryological support for evolution was disapproved by

1. Oparin
2. Alfred Wallace
3. Karl Ernst von Baer
4. Charles Darwin

From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask

1. CH3, H2, NH3 and water vapor at 600
2. CH4, H2, NH3 and water vapor at 800
3. CH3, H2, NH4 and water vapor at 800
4. CH4, H2, NH3 and water vapor at 600

Flippers of Penguins and Dolphins are examples of

1. Adaptive radiation
2. Natural selection
3. Industrial melanism
4. Convergent 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