Question

how does crossing over occur and why is this important to cells

Answer 1

Hai Sweet Friend, @xoxosaralyn WelcoMe To OpeN studY !!


Cross-over is one part of gene mixing that leads to the expression of new traits (phenotypes) in development after fertilization.
For example:
Homologous chromosomes are two identical chromosomes that come from different parents. Each having a maternal (mother) chromosome and a paternal (father) chromosome. They carry the same genes but specify slightly different traits.
During Prophase, homologous pairs exchange large numbers of genes by swapping (cross-over) whole pieces of chromosome. Thus one of the maternal chromatids ends up with a piece of paternal chromosome, and a paternal chromatid receives the corresponding piece of maternal chromosome. Mixing genetic material (cross-over) is unique to meiosis one of the reasons sexual reproduction has been such a powerful evolutionary force.

Importance:
Crossing over produces variety within the species. The more variety the more chances the species has to adapt to a changing environment. Meiosis produces a variety of gametes designed to foster this kind of diversity.

Hope, if U Are Satisfied with this answer, Please Close This Question !

Thank U !! Keep In Touch, with Open study !!

Answer 2

I wish OS could provide me an audible-auto-typing device, much better than writing again and again !

Answer 3

Good work @Koikkara ! :)