Question

During Which Phase Of Meiosis Does Crossing Over Of Chromosomes Occur? Prophase I Metaphase I Anaphase I Telophase I

Answer 1

Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I. By meiosis II, only sister chromatids remain and homologous chromosomes have been moved to separate cells.

Answer 2

The correct answer is OPTION 1: Prophase I.

• During prophase I, homologous chromosomes align to create tetrads.
• During this lining up, DNA sequences between homologous chromosomes can be exchanged.
• Crossing over is a form of genetic recombination that allows meiosis daughter cells to be genetically diverse from one another.
• Only homologous chromosomes can cross.
• Cells become haploid and lose their ability to cross across after meiosis I.