13. Why is sex-linked
inheritance an example of
nonmendelian inheritance?

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Sex-linked inheritance is a of
nonmendelian inheritance because
opposes Mendel’s first law,
postulates that each trait always
conditioned by two (alleles). In
nonhomologous regions the sex
chromosomes the of the
genes contain one allele (even in
case of the XX , i.e., in
women, one the X chromosomes is
).