LIFE SCIENCE

Detailed explanation-1: -Mutation: The change in the genes of individuals living in a population leads to genetic variation. Genetic recombination: The fusion of gametes promotes the various combination of genes in a population leading to genetic variation.

Detailed explanation-2: -Mutations and recombination are major sources of variation.

Detailed explanation-3: -Sexual reproduction results in genetic variation, or genetic differences, between parents and offspring. Offspring inherit one set of chromosomes from each parent. So, an offspring has a mixture of chromosomes (and alleles) from its two parents.

Detailed explanation-4: -The genetic diversity has three different sources: mutation, recombination and immigration of genes. Mutation is the driving force of genetic variation and evolution.

Detailed explanation-5: -Crossing over (in prophase I) Random assortment of chromosomes (in metaphase I) Random fusion of gametes from different parents.