Category: CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR

Which of the following statements is NOT correct regarding effect of genetic drift? (1) It alters allele frequency substantially only in small population. (2) It can cause allele frequencies to […]

Twenty small populations of a species, each polymorphic for a given locus (T, t) were bred in captivity. In 10 of them the population size was kept constant by random […]

Northern elephant seal had been reduced to about 20 in 1800s. Biologist studied variation in protein in the species. They found no genetic differences in the protein among individuals. This […]

In a massive earthquake on island only few related species of lizards survived and occupied the island. The phenomenon is also referred as (1) Founder effect (2) Bottle Neck effect […]

Which statement is NOT true regarding genetic drift as an evolutionary force? (1) It is significant in small population (2) It generates variance in population (3) It leads to fixation […]

Genetic Drift occurs by (1) Chance (2) Immigration (3) Emigration (4) Mutation   Genetic drift is a fundamental concept in evolutionary biology, describing how chance events can lead to random changes in […]

Random change of gene frequency in a population is termed as- (1) Genetic drift (2) Gene flow (3) Mutation (4) Evolution   What is Genetic Drift? Genetic drift is the change […]

Abrupt changes in gene frequency in a small population is termed as (1) Gene migration (2) Genetic drift (3) Gene flow (4) Gene fluctuation   Genetic diversity is the cornerstone […]

Disaster such as earthquake or fire may reduce the size of population drastically and the genetic make up of the small surviving population is unlikely to be representative of make […]