Individuals with a recessive gene inheritance pattern should be advised that
a. if one parent is a carrier, there is a 50 percent chance of having affected children
b. prenatal screening for recessive gene disorders is rarely performed
c. the disease is passed from generation to generation
d. if both parents are carriers, there is a 25 percent chance of having affected offspring
D
If both parents are carriers, there is a 25 percent chance of having affected offspring. A recessive disease can only be phenotypically expressed when two copies of the mutant allele are present; therefore, both parents must equally contribute to this outcome. Because there is a risk of having an affected offspring, prenatal screening may be performed. A disease passed from generation to generation occurs because of autosomal dominant inheritance.
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