Question

what does haploid mean?
a cell has one set of chromosomes, or half the usual amount.
a cell has two sets of chromosomes, which is the usual amount.
a cell has one set of chromosomes, which is the usual amount.
a cell has two sets of chromosomes, or half the usual amount.

Explanation:

Haploid refers to a cell having one set of chromosomes. In sexual reproduction, gametes (sperm and egg) are haploid. The normal body cells (somatic cells) are diploid (two sets of chromosomes). So haploid is half the usual (diploid) amount of chromosomes.

Answer:

A. A cell has one set of chromosomes, or half the usual amount.