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

Gap-fill exercise

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