How many daughter cells does a diploid germ-line cell produce through meiosis?

A diploid germ-line cell, which contains two complete sets of chromosomes, goes through a process called meiosis to produce gametes. Meiosis consists of two sequential rounds of cell division: meiosis I and meiosis II.

In meiosis I, homologous chromosomes are separated and each daughter cell receives one chromosome from each pair, resulting in two cells, each with half the chromosome number—thus haploid. Then, during meiosis II, each of these two haploid cells undergoes another division, similar to mitosis, where the sister chromatids are separated. This results in a total of four haploid daughter cells from the original diploid germ-line cell.

The crux of this process lies in the reduction of chromosome number from diploid to haploid, producing four genetically distinct gametes, which is precisely what the answer indicates. This is essential for sexual reproduction as it allows for genetic diversity.