Final answer:
Human gametes contain one sex chromosome, as they are haploid cells with only one chromosome from each pair, ensuring a zygote will have a complete set of chromosomes after fertilization. Therefore, the correct answer is B) one.
Step-by-step explanation:
Human gametes, which are the reproductive cells (sperm and egg cells), contain one sex chromosome each. This is because gametes are haploid cells, meaning they contain half the number of chromosomes found in diploid cells such as somatic (body) cells.
Since humans have 23 pairs of chromosomes, with 22 pairs being autosomes and one pair being sex chromosomes (X and Y), each gamete from a human will contain only one chromosome from each pair, including one sex chromosome.
Therefore, the correct answer is B) one. This ensures when gametes combine during fertilization, the resulting zygote will have a complete set of chromosomes: 22 pairs of autosomes and one pair of sex chromosomes.