Question 3(Multiple Choice Worth 4 points)
(03.05 MC)
In what stage of meiosis is crossing over most likely to occur?
O Prophase I
O Anaphase II
O Metaphase I
O Prophase II
Prophase I is stage of meiosis is crossing over most likely to occur.
During prophase I is when crossing over takes place. This is the sole time the cell has to transport DNA segments between the homologous pair since prophase I is the only time when the complex that momentarily forms between homologous chromosomes is present.
When the paired homologs, or chromosomes of the same kind, are lined up during meiosis, crossing over is a biological process that takes place.
Therefore, if two Chromosome 1s are lined up, one of them will break, and the other will reanneal with a break in a comparable location on it.Crossing over:
In meiosis, the term "crossing over" describes the transfer of genetic material or chromosome segments between non-sister chromatids.
This genetic process involves the exchange of homologous chromosomes and homologous portions of corresponding chromosomes.
The exchange of genetic material between non-sister chromatids of homologous chromosomes occurs during crossing over, an enzyme-mediated process.It happens during meiotic prophase I pachytene stage.
To know more about crossing over check the below link:
