Question

reproduction is responsible for variations in organisms
in a population that help them to survive in
the environment.
Plz explain.​

Answer 1

Answer:

Key Points

Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population.

Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).

Genetic variation is advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.

Key Terms

genetic diversity: the level of biodiversity, refers to the total number of genetic characteristics in the genetic makeup of a species

crossing over: the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes

phenotypic variation: variation (due to underlying heritable genetic variation); a fundamental prerequisite for evolution by natural selection

genetic variation: variation in alleles of genes that occurs both within and among populations

Answer 2

• Variation acts as a source of raw material for evolution of species.

• Variation leads to genetic diversity, which is a key for the evolution of species. Animals are able to adapt themselves to the changing environment by inheriting some of the beneficial variations. Organisms are better suited to face the struggle for existence due to the presence of variations.

• Variations give the species an individuality of their own. In the absence of variation, there would be no science of heredity as all individuals of a race, would be identical to one another in all aspects.

All the variants, however, do not have equal chances of survival. Depending on the environmental conditions, the nature favours only those variants that are able to adjust to the changing environment. The theory of natural selection favours the survival of the fittest.