Question

1. what accounts for genetic material from each of an organisms parents being present in sperm and egg cells?

crossing over during meiosis
regeneration of new cells
crossing over during mitosis
cytokinesis of new cells

Explanation:

During meiosis, crossing - over occurs which allows for the exchange of genetic material between homologous chromosomes. This results in genetic material from each of an organism's parents being present in sperm and egg cells. Mitosis is for growth and repair and doesn't involve the same genetic recombination for gametes. Regeneration and cytokinesis are not related to this genetic mixing in gametes.

Answer:

crossing over during meiosis