1.During which epoch does a major extinction event begin? A. Eocene b. Oligocene

Question

1.During which epoch does a major extinction event begin? A. Eocene b. Oligocene c. Miocene d. Pleistocene e. Recent - correct . Why is E correct and the others are not?

2. Sympatric speciation through polyploidy has been a frequent phenomenon in the evolution of (plants) a. insects. b. mammals. c. bacteria. d. plants. e. fish. Why is D correct and the others are not?

3. When a population goes through a bottleneck a. genetic drift is likely to occur b. mutation rates increase. c. extinction rates decrease. d. natural selection decreases in intensity e. mutation rates decrease Why is a correct and the others are not?

Explanation / Answer

1.Correct answer is: E.Recent

Reason:The major extinction event bean in recent epoch because in this period large and mass extinction of plants and animals took place due to huge volcanic eruptions.

2.Correct answer is:D.plants

Reason:In plants,symaptric speciation through polyploidy has been frequent as  chances of doubling of the chromosome number could lead to reproductive isolation through the process of zygote inviability and without the neccesity for geographic isolation.

3.Correct answer is:a. genetic drift.

Reason:When population size is reduced for one generation at least, it is known as bottle neck effect.Genetic drift reduce genetic variation in small populations and when bottleneck occurs, it can reduce a population's genetic variation and lead to greater genetic drift event.

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