Which of the following is NOT a characteristic of an autosomal recessive trait?
A) All of the children of two affected individuals are affected.
B) If two individuals are heterozygous, the risk of having an affected child is 1:4.
C) For rare traits, affected individuals have unaffected parents.
D) Every affected individual has at least one affected parent.
E) All of these are characteristic of an autosomal recessive trait.
Correct Answer:
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