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20 Sep 2018
Sandra and Steven are expecting their first child. Each have one female sibling who is affected with PKU (Phenylketonurea) and no other family history of the disorder is known on either side. They ask what their risk is of having an affected child. What do you tell them? A) They must both be heterozygotes so their risk of having an affected child is 25%.
B) There is a 50% chance they are heterozygous carriers so they should get genetic testing.
C) Since neither one of them is affected, they are not at risk of having an affected child.
D) You can't give them any firm answers because you don't know their genotypes.
E) Since this disorder is an autosomal recessive no one in the next generation will have the disease.
Sandra and Steven are expecting their first child. Each have one female sibling who is affected with PKU (Phenylketonurea) and no other family history of the disorder is known on either side. They ask what their risk is of having an affected child. What do you tell them? A) They must both be heterozygotes so their risk of having an affected child is 25%.
B) There is a 50% chance they are heterozygous carriers so they should get genetic testing.
C) Since neither one of them is affected, they are not at risk of having an affected child.
D) You can't give them any firm answers because you don't know their genotypes.
E) Since this disorder is an autosomal recessive no one in the next generation will have the disease.
Beverley SmithLv2
21 Sep 2018
