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Is crossing over important for the diversity of biological evolution?
Sexual reproduction and recombination of linked genes (crossing over) are, with mutations, the main instruments of biological variability. Sexual reproduction allows many combinations among genes situated in different chromosomes. Crossing over, though, is the only means to provide recombination of alleles located in a similar chromosome. Crossing over probably emerged and has been maintained by the evolution because of its importance to biological diversity.
Pachytene: The pairing of homologous chromosomes is completed. Chromosomes become more and more thick. Each bivalent has four chromatids , which wrap around each o
Why is it necessary to have the second division in meiosis even though cells have already been reduced to haploid number after the first division?
GIVE THE SHORT DETAIL OF HE BIOLOGICAL METHODS
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MODIFICATION OF MITOSIS 1 . CRYPTOMITOSIS OR PROMITOSIS : Primitive type of mitosis. In this mitosis nuclear membrane not disappear (remain intact throughout the div
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Skeletons of radiolarians The skeletons of radiolarians and foraminiferans form a primary constituent of ocean bottoms where they form 30% or more of the sediment. It is calle
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