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.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?