Question $50(1$ point$)$

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Prenatal testing for genetic disorders like cystic fibrosis can be done by first screening the mother, then only screening the father if the mother carries the allele for CF$.$

The father needs to be tested in this scenario because if the baby only carries ONE allele for the trait he will not have symptoms of the disease. CF is an example of

a disorder caused by nondisjunction

an autosomal recessive disorder

an autosomal dominant disorder

a sex$-$linked disorder