The point where chromosomes cross over and exchange dna during meiosis is called the

Your answer is prophase 1.

Prophase 1 is seen as the beginning of meiosis. In this step, duplicated chromosomes condense (from DNA duplication previously), homologs loosely pair along their lengths, and homologous chromatids exchange genetic material (this is what you are describing). The nucleus also disappears, and a spindle forms.

Hope this helps!

the answer is b.) hydrogen bonds between bases.