Question

question 5 of 13
during mammalian fertilization, two haploid gamete cells fuse to generate a diploid cell called a zygote. each parent donates a set of chromosomes, yielding offspring that carry both a maternal and a paternal set of chromosomes. each chromosome within the maternal set has a correlative chromosome within the paternal set that encodes for the same hereditary characteristics. these corresponding chromosomes are called homologous pairs.
diploid mammalian cells have
two pairs of homologous chromosomes.
one group of chromosomes.
two sets of chromosomes.
two chromatids.

Explanation:

The passage states diploid cells form when two haploid gametes (each with one set of chromosomes) fuse, resulting in offspring with both maternal and paternal chromosome sets. This matches the definition of a diploid cell having two complete sets of chromosomes. The other options are incorrect: "two pairs of homologous chromosomes" is too narrow (diploid cells have many homologous pairs, not just two), "one group of chromosomes" describes haploid cells, and "two chromatids" refers to a single replicated chromosome, not a diploid cell's total chromosome content.

Answer:

two sets of chromosomes.