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I was reading this article in wikipedia and came across this :

It has been suggested that recombination takes place during G1, when the DNA is in its 2-strand phase, and replicated during DNA synthesis.

If For example - allele A is present on 1 and a is present on 1' and recombination happens such that a is present on 1 and A on 1' and then both get duplicated during S phase.

So how are the daughter cells going to be different from one another and from the mother cell in terms of phenotype? (obviously the alleles around these alleles are going to change)

How can this result in twin spotting in drosophila or any other trait occurring due to coming together of homozygous alleles by mitotic crossovers ?

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