Question

the term for different genes. example: the gene for short stems is \t\ and the gene for long stems is \t\.
natural selection
evolution
variation
population bottleneck
genetic drift
gene flow
alleles

Explanation:

We need to identify the term for different forms of a gene. Natural Selection is about survival of fittest, Evolution is change over time, Variation is differences in traits, Population Bottleneck is a reduction in population, Genetic Drift is random change in allele frequencies, Gene Flow is transfer of genes between populations. Alleles are different versions of a gene, like "T" and "t" for stem length.

Answer:

Alleles