Evolution · Question 47

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as :

1. Genetic drift
2. Genetic load
3. Genetic flow
4. Random mating

The process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge is called :

1. Convergent evolution
2. Adaptive radiation
3. Natural selection
4. Non-random evolution

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of :

1. Homologous organs that have evolved due to divergent evolution
2. Analogous organs that have evolved due to convergent evolution
3. Homologous organs that have evolved due to convergent evolution
4. Analogous organs that have evolved due to divergent evolution

Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as :-

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

Genetic variation in a population arises due to :

1. Reproductive isolation and selection
2. Mutations only
3. Mutations as well as recombination
4. Recombination only

Dinosaurs dominated the World in which of the following geological era ?

1. Jurassic
2. Devonian
3. Coenozoic
4. Mesozoic

The finch species of Galapagos Islands are grouped according to their food sources. Which of the following is not a finch food ?

1. Insects
2. Carrion
3. Tree buds
4. Seeds

The idea of mutations was brought forth by :

1. Charles Darwin, who observed a wide variety of organisms during sea voyage
2. Hugo de Vries, who worked on evening primrose
3. Gregor Mendel, who worked on Pisum sativum
4. Hardy and Weinberg, who worked on allele frequencies in a population

Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as

1. Divergent evolution
2. Natural selection
3. Migration
4. Adaptive radiation

Which one of the following options gives one correct example each of convergent evolution and divergent evolution ?

1. Convergent evolution Thorns of Bougainvillea and tendrils of Cucurbita & Divergent evolution Eyes of octopus and mammals
2. Convergent evolution Eyes of octopus and mammals & Divergent evolution Bones of forelimbs of mammals and vertebrates
3. Convergent evolution Thorns of Bougainvillea and tendrils of Cucurbita & Divergent evolution Wings of butterflies and birds
4. Convergent evolution Bones of forelimbs of vertebrates & Divergent evolution Wings of butterfly and birds