Which of the following is an example of genetic variation?

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One person has a scar, but his friend does not have one.

One person is older than another.

Reeta eats meat, but her sister Geeta is a vegetarian.

Two children have different eye colours.

answer is D.

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Detailed Solution

Genetic variation is the presence of distinct gene sequences among the various members of a species.
A change in the sequences of genes in DNA (genetic material) can cause variations in eye colour.

Melanin is a pigment that is produced, transported, or stored by most of the genes connected to eye colour. The quantity and quality of melanin found in the outer layers of the iris have a direct impact on a person's eye colour.

Thus, the two children having different eye colours is an example of genetic variation.

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