Does crossing over occur while formation of gametes i.e gametogenesis or it happens after the fertilization...? And if it occurs then crossing over occurs between what as there is only one parent ???
Answers
Answer:
crossing over occurs during gametogenesis and not after fertilisation.
crossing over is essential for creating variations in gametes and thus offsprings by exchanging parts of parental chromosomes each other( paternal and maternal).
crossing over happens among the maternal and paternal DNA of an organism resulting in the formation of a gamete having property of both the parents. It only takes place in gametic cells (germ cells) and not in somatic cell during gamete formation .
such gametes of 2 different parents fuse togather to form a different offspring.
for vegitative reprodiction crossing over is not present.
Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.