During which phase of meiosis does crossing over of chromosomes occur?

Prophase 1

Explanation:

The main consequence of meiosis, no doubt, is the emergence of diversity among individuals that are produced in the sexual reproduction of the species.

The relationship between meiosis and variability is mainly based on the occurrence of crossing-over, which is a genetic phenomenon that occurs during Prophase 1.

Crossing over is a phenomenon involving homologous chromatids. It consists of the breaking of these chromatids at certain points, followed by an exchange of corresponding pieces between them.

Exchanges cause new gene sequences to appear along the chromosomes. Thus, if on a chromosome there are several genes combined in a certain sequence, after the occurrence of crossing the combination may no longer be the same.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.