Which best describes a gene?
different allele forms of a trait
tightly coiled strands of dna
the center of a chromosome
a segment of chromosomal dna

I I think the answer is D. The gene is unit that contains the traits from both parent alleles. The gene contains segments of DNA strands which mutates when it undergoes a series of mutation in order to create a a new segments of DNA from both parent genes.

Search on internet it may you