an organism's genotype describes its specific combination of alleles. for example, an aa genotype is heterozygous for the a allele. an organism's phenotype describes a visible trait, such as tall height, brown eyes, or black fur. how does genotypic variation occur? a. genotypic variation occurs when alleles are randomly sorted during asexual reproduction. b. genotypic variation occurs when alleles are randomly sorted during sexual reproduction. c. genotypic variation only occurs when genetic mutations occur. d. genotypic variation only occurs during binary fission.

In biology, variation means any difference between cells, individual organisms, or groups of organisms of any species that is caused either by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation) or by genetic differences (genotypic variation).

The cause of genotypic variation (genetic variation) is differences in number or structure of chromosomes or by differences in the genes carried by the chromosomes. Body form, eye colour, skin color, and disease resistance are examples of genotypic variations.

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