Question

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

Explanation:

To determine the best definition of a gene, we analyze each option:

• "the DNA found in gametes" is incorrect because genes are not limited to gametes; they are present in all cells with DNA.
• "all of the DNA that makes up a chromosome" is incorrect. A chromosome contains many genes along with non - coding DNA. A gene is not the entire DNA of a chromosome.
• "a specific segment of DNA on a chromosome" is correct. Genes are specific regions of DNA on chromosomes that code for a particular trait or function (such as coding for a protein or a functional RNA).

Answer:

C. a specific segment of DNA on a chromosome (assuming the options are labeled A, B, C as the first option is A, second B, third C)