Homologous chromosomes trade pieces of DNA. When crossing over occurs, segments of non-sister chromatids break and then reattach to the other chromatid.
Crossing over is a process which starts in pachytene stage of meiosis I. In crossing over, the non sister chromatids of homologous chromosomes of each parent exchange DNA segments so as to generate chromosomes with new combination of genes or we can say that the chromosomes formed after crossing over have different sequences of DNA than the parental one. When these chromosomes with new genetic make up are inherited in the progenies, the progenies have variations because they do not have exactly the same DNA sequence as of parents. The significance of crossing over is generation of variations among individuals of a species.
<em>Oh i think if you search for your friend then I think it will come... I THINK!! I am not sure... Sorry if I am wrong... I am trying to answer all the question properly.</em><em> </em><em>Have </em><em>a </em><em>nice </em><em>day:</em><em>)</em>
refers to a condition in which muscle movement has become weakened or impaired. You may also sometimes see it referred to as “mild paralysis” or “partial paralysis.” Although paresis affects your muscles, it usually occurs due to nerve damage.
