Question

crossing over occurs * 1 point during meiosis i when homologous chromosomes exchange segments of genetic material. what is the most important result of this process? it stops the production of new sex cells. it prevents the cell from dividing too quickly. it ensures that the resulting cells are diploid. it significantly increases the genetic variation in the offspring.

Explanation:

Crossing - over during Meiosis I involves the exchange of genetic material between homologous chromosomes. This process is crucial for genetic diversity.

• Option 1: Crossing - over does not stop the production of new sex cells. Meiosis is the process that produces sex cells (gametes), and crossing - over is a part of Meiosis I which is a step in gamete production.
• Option 2: There is no relation between crossing - over and preventing the cell from dividing too quickly. Cell - cycle checkpoints are responsible for regulating the speed of cell division.
• Option 3: Meiosis results in haploid cells (gametes), not diploid cells. Mitosis results in diploid cells (in somatic cells).
• Option 4: By exchanging genetic material, new combinations of genes are created. These new gene combinations are passed on to the offspring, significantly increasing genetic variation in the offspring.

Answer:

It significantly increases the genetic variation in the offspring.