Which term describes the form of a gene that produces a specific trait such as eye color

Allele is the term that describes the form of a gene that produces a specific trait such as eye color.

An allele is a variant form of a gene that is situated at a certain position on a specific chromosome. Alleles influence the work of gene as they determine specific traits such as eye colour and skin colour that can be passed on from parents to offspring through sexual reproduction. Diploid organisms (organisms with one set of homologous chromosome) such as humans usually possess two alleles for a trait.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.