Question

what must happen before meiosis can begin? *
the dna within the cell must be divided in half, so each new daughter cell receives a set of dna.
the cell must go through metaphase and anaphase to properly separate pairs of homologous chromosomes.
dna replication - each chromosome is duplicated to form two identical sister chromatids.
gametes must grow bigger to be able to fit the new cells that will be made during meiosis.

Explanation:

Before meiosis begins, DNA replication occurs. This is a crucial step as it ensures that each chromosome is duplicated to form two identical sister chromatids. This duplication provides the necessary genetic material for the subsequent divisions in meiosis. The first option is incorrect because DNA division in half happens during meiosis, not before. The second option refers to events (metaphase and anaphase) that occur during meiosis, not before. The fourth option is incorrect as gametes are the end - products of meiosis and do not grow to fit new cells before meiosis starts.

Answer:

DNA Replication - Each chromosome is duplicated to form two identical sister chromatids.