Question

Crossing over takes place during: 

Options

• prophase of meiosis I

• anaphase of meiosis I

• prophase of meiosis II

• anaphase of meiosis II

Answer 1

prophase of meiosis I

Explanation:

Crossing over is the mutual exchange of blocks of homologous genes between a pair of homologous chromosomes. This process takes place during the prophase I stage of meiosis. During this phase, homologous chromosomes pair up closely and exchange corresponding segments of chromatids at points called chiasmata. This exchange results in new combinations of genes, increasing genetic variability in the gametes. Crossing over does not occur during anaphase or meiosis II stages.