Question

which meiosis processes work together to create the most genetic diversity in populations? (select the two correct answers.) (1 point) crossing - over of matching chromosomes random assortment of chromosomes. cytokinesis splitting the cell contents making nuclear envelope around dna. splitting sister chromatids in meiosis ii copying dna before cell division

Explanation:

• Crossing - over of matching chromosomes: During prophase I of meiosis, homologous chromosomes exchange genetic material. This recombination creates new combinations of alleles on the chromosomes, increasing genetic diversity.
• Random assortment of chromosomes: In metaphase I of meiosis, homologous chromosome pairs align randomly at the metaphase plate. The way these chromosomes assort (i.e., which chromosome of a pair goes to which daughter cell) is random. This independent assortment leads to different combinations of maternal and paternal chromosomes in the gametes, contributing to genetic diversity.

• Cytokinesis splitting the cell contents: This is just the physical division of the cell's cytoplasm. It does not directly contribute to genetic diversity as it is more about cell - division mechanics rather than genetic recombination or assortment.
• Making nuclear envelope around DNA: This is part of the process of forming new nuclei during cell division (telophase). It is a structural event related to cell division and not a process that generates genetic diversity.
• Splitting sister chromatids in Meiosis II: This is similar to the process in mitosis. It ensures that each daughter cell gets a complete set of chromosomes, but it does not create new genetic combinations. The genetic information on the sister chromatids (before separation) was already determined by events in meiosis I (such as crossing - over).
• Copying DNA before cell division: DNA replication (copying) is a necessary step to ensure that each daughter cell gets a full set of genetic material. But it creates identical copies (barring mutations, which are not considered in the context of normal meiotic processes for this question) and does not itself create new genetic combinations.

Answer:

Crossing - over of matching chromosomes, Random assortment of chromosomes