[" Q.37According to darwin,the main mechanism of evolution "],[" 1) Genetic Recombination "],[" 2) Genetic drift "],[" 3) Gene flow "],[" 4) Datural selection "]

Define the terms : a) Gene Flow b) Genetic drift.

Odd man out. Justify your answer. recombination Genetic drift Gene migration Natural selection Mutation Speciation.

[" Pouched mammals of australia survived "],[" due to :- "],[" (1) Mutation "],[" (2) Gene migration "],[" (3) Continental drift "],[" (4) Reason is not clearly known "]

Mention the role of Gene-flow in evolution. Mention two main characteristics of genetic drift.

Differentiate "Gene flow' and 'Genetic drift'.

According to modern synthetic theory of evolution proposed by Dobzhansky, all of the following are causes of genetic variability except (a) Gene mutations (b) Genetic recombination (c) Changes in chromosome number (d) Natural selection

Gene pool of a large population tends to remain stable i.e. in genetic equilibrium in presence of (a) Random mating (b) Genetic drift (c) Large scale migration (d) Natural selection

Find out the odd one in each group. a. Cat’s paw, insect wings, horse foot, bat’s wing, human hand. b. Industrial melanism, mutation, genetic drift, gene migration. c. Vermiform appendix, plica semilunaris, spleen, pelvic girdle of python, cervical fistula. d. Coenozoic, mesozoic, palaeozoic, proterozoic, holozoic e. Isolation, recombination, genetic drift, gene migration, natural selection, mutation, speciation.

Assertion : Hardy-Weinberg principle states that in the absence of disturbing influences, gene frequencies of large populations of sexually reproducing organisms do not change , provided that matings occur at random. Reason : The disturbing influences include mutation, gene flow genetic drift, genetic recombination and natural selection.