The X and Y chromosomes are not homologous,but in the meiosis of sperm formation,they pair and separate in anaphase I as though they were homologous.

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During meiosis of sperm formation, the X and Y chromosomes pair and separate in anaphase I as though they were homologous, even though they are not actually homologous. This occurs because the chromosomes share regions of similarity, known as pseudoautosomal regions, which allow them to pair and segregate properly during meiosis.

The X and Y Chromosomes Are Not Homologous,but in the Meiosis