LIFE SCIENCE

Detailed explanation-1: -Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

Detailed explanation-2: -Genetic variants are differences in DNA sequence between individuals in a population. Structural variations, single-nucleotide polymorphisms/variations (SNPs/SNVs), insertion and deletion variations, copy number variations, and translocations and inversions are the main types of variants.

Detailed explanation-3: -The three main sources of genetic variation arising from sexual reproduction are: Crossing over (in prophase I) Random assortment of chromosomes (in metaphase I) Random fusion of gametes from different parents.

Detailed explanation-4: -The ultimate source of genetic variation is random mutation-changes in nucleotide sequences of DNA.

Detailed explanation-5: -mutation. random mating between organisms. random fertilization. crossing over (or recombination) between chromatids of homologous chromosomes during meiosis. 08-Jun-2022