Which example is a variant of a gene?
an autosome
an allele
a chromosome
a gamete previous

The correct answer is an allele.

Explanation:

The variant form of a gene is termed as allele.Some genes exits as various different forms at a specific position on a chromosome also called genetic locus.

   Humans are diploid organism.The diploid nature is due to the presence of two allele at each genetic locus among them one allele is inherited from paternal origin and the other allele is inherited from maternal origin.

explanation: grsaa

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."