Question

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

Explanation:

A gene is defined as a specific, functional segment of DNA located on a chromosome that codes for a trait or protein. The first option matches this definition. The second option is incorrect because a chromosome contains many genes, not just one. The third option is incorrect because gametes contain full sets of chromosomes (with many genes), not just a single gene.

Answer:

a specific segment of DNA on a chromosome