Assume for a moment that crossing-over did not occur. Would you agree that you received half of your chromosomes from each parent? Would you agree that you received one-quarter of your chromosomes from each grandparent? Would the answer to these questions change if you allowed for crossing-over to have occurred
Answere : Recombination is accomplished through crossing over in which non-sister chromatids of homologous chromosomes exchange the chromosomal segments. Yes, we recieve half number of chromosomes from each parent due to Mendal's "law of independent assortment" Crossing over is just a mechanism for suffling of genetic material. You could theoretically have received anywhere from zero to 23 chromosomes from specific parent. If crossing over occurs, you no longer recieve strictly pure maternal or paternal chromosome, but a portion of each of the two parents.
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