Are the alleles of a gene necessarily originated one from the father and the other from the mother? Are there exceptions?

1 year ago
Biology

It is natural that alleles have come one from the father and the other from the mother but it is not obligatory. In a “clone” generated by nucleus transplantation technology, for example, the alleles come from a single individual. In polysomies (as in trisomy 21) each gene of the affected chromosome has three alleles, in trisomies, or four, in tetrasomies.

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Dipti KC
May 26, 2023
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