Mechanism: variation, mutation, recombination, natural selection
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See all →- Which one of the following is NOT an advantage of inbreeding? Answer: 1. It decreases the productivity of inbred population, after continuous inbreeding. Key idea: Inbreeding increases homozygosity. It... 1
- Given below are two statements:Statement I: RNA mutates at a faster rate.Statement II: Viruses having RNA genome and shorter life span mutate and evolve faster.In the light of the above statements, choose the correct answer from the options given bel… Answer: 2. Both Statement I and Statement II are true. Key idea: RNA genomes mutate faster than DNA genomes. Statement I is true: RNA is les... 1
- Natural selection where more individuals acquire specific character value other than the mean character value, leads to : Answer: 3. Directional change Key idea: When more individuals move to one extreme of the trait, away from the mean, the curve shifts one way... 1
- Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action ?(a) Darwin's Finches of Galapagos islands.(b) Herbicide resistant weeds.(c) Drug resistant eukaryo… Answer: 3. (b), (c) and (d) Key idea: Look for evolution driven by human-caused environmental change. (b) Herbicide-resistant weeds, (c) dru... 1
- By which method was a new breed 'Hisardale' of sheep formed by using Bikaneri ewes and Marino rams ? Answer: 3. Cross breeding Hisardale is a product of cross breeding, in which superior males of one breed are mated with superior females of... 1
- Select the incorrect statement. Answer: 3. Inbreeding selects harmful recessive genes that reduce fertility and productivity. Inbreeding increases homozygosity, helps make... 1