Question
Why is crossing over such an important event in meiosis?
During which phase of meiosis does crossing over occur?
During which phase of meiosis does crossing over occur?
Answers
GPT-4o mini
Crossing over is an essential event in meiosis because it promotes genetic diversity. During this process, homologous chromosomes exchange segments of genetic material. This results in new combinations of alleles on each chromosome, which contributes to variation in gametes (sperm and egg cells). This genetic diversity is crucial for evolution and provides populations with a better chance to adapt to changing environments.
Crossing over occurs during prophase I of meiosis. Specifically, it happens during a stage called pachytene, when homologous chromosomes pair up closely in a process called synapsis, forming structures known as tetrads. The physical exchange of segments between the chromatids of homologous chromosomes takes place at this stage.
Crossing over occurs during prophase I of meiosis. Specifically, it happens during a stage called pachytene, when homologous chromosomes pair up closely in a process called synapsis, forming structures known as tetrads. The physical exchange of segments between the chromatids of homologous chromosomes takes place at this stage.