meiosis: crossing over - Students, Britannica Kids

Crossing over, or recombination, occurs in the early stages of meiosis, when the homologous pairs of replicated chromosomes are in close proximity. In most cases, crossing over is beneficial because it increases genetic variation in offspring.

Cell - Mitosis, Cytokinesis, Prokaryotes

Meiosis & Crossing Over

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Meiosis, inheritance and variation — Science Learning Hub

cell - Students, Britannica Kids

During which phase of meiosis does the crossing over of