Question

during what stage do the homologous chromosomes align (during synapsis) and form the tetrad to cross over?
telophase 1
anaphase 1
metaphase 1
prophase 1
rewatch

Explanation:

During Prophase 1 of meiosis, homologous chromosomes pair up (synapsis) to form tetrads. This is the stage where crossing - over (exchange of genetic material between non - sister chromatids of homologous chromosomes) occurs. Telophase 1 is about the formation of two nuclei. Anaphase 1 is when homologous chromosomes separate. Metaphase 1 is when homologous chromosomes align at the equatorial plate, but the key event of synapsis and tetrad formation (for crossing - over) occurs in Prophase 1.

Answer:

Prophase 1