Question

which phrase is the best definition of a gene? the dna found in gametes a specific segment of dna on a chromosome all of the dna that makes up a chromosome

Explanation:

A gene is defined as a specific segment of DNA on a chromosome that codes for a particular trait or function. DNA in gametes is genetic material but not the best - definition of a gene. Also, all of the DNA that makes up a chromosome is not a gene as a chromosome contains multiple genes and non - coding DNA regions.

Answer:

a specific segment of DNA on a chromosome