What do you mean by white matter?
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Crossing over occurs between homologous chromosomes, and is closely involved in genetic variation. <em>The stage that most contributes to </em><em>diversity</em><em> is stage C, </em>where you can see chromosomes after crossing-over.
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There are different mechanisms involved in producing genetic variation among descendants. These are,
- Crossing-over between homologous chromosomes (prophase 1),
- Random lining of homologous chromosomes (metaphase 1),
- Random fertilization
The Crossing-over events occur between two homologous chromosomes in the equatorial plane and make the daughter cells genetically different from the original one.
The Chiasma is the position where two homologous chromatids interchange genetic information, giving a place for new genetic material or information to be provided to descendants.
After crossing over, homologous chromosomes get separated again.
In the attached imaged there are four different stages of meiosis.
Stage C is the one that contributes the most to diversity.
We can see that crossing over has already occurred between homologous chromosomes, and they have already interchanged segments.
<em>In the image you will see the difference between </em><em>chromosomes</em><em> that has gone through the</em><em> crossing over </em><em>mechanism, and </em><em>chromosomes</em><em> that has not. The difference in color represents segments interchange and variation.</em>
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You can learn more about crossing over at
brainly.com/question/12911831?referrer=searchResults
brainly.com/question/394891?referrer=searchResults
