Test: Mechanism of Evolution - Class 10 MCQ

Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error).

Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.

Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to 100\%100%100, percent frequency, of other alleles.

Genetic drift can have major effects when a population is sharply reduced in size by a natural disaster (bottleneck effect) or when a small group splits off from the main population to found a colony (founder effect).

The primary function of the flight feathers is to aid in the generation of both thrust and lift, thereby enabling flight. The flight feathers of some birds have evolved to perform additional functions, generally associated with territorial displays, courtship rituals or feeding methods.

The changes occurring in the reproductive tissues of an organism are inherited from one generation to another.

Genetic drift is the change in the frequency of an allele in a population due to random sampling and the random events that influence the survival and reproduction of those individuals.

The sex of the child is determined in human beings by the chromosomes like female have two X chromosomes XX and male have one X chromosome and one Y chromosome XY. So in this way, sex is determined