Darnell and Tinaka are each carriers of an autosomal recessive disorder that is lethal in early childhood. They want to have a child who is free of the disease, so they have preimplantation genetic diagnosis. Unfortunately, their child has the disease. A scientific explanation is that
A) the blastomere that was tested had undergone a somatic mutation, making it not representative of the rest of the embryo.
B) Darnell was not really the father.
C) the 7 cells of the remaining embryo each underwent a mutation, so the sampled cell was not representative.
D) Darnell or Tinaka is really homozygous recessive, and not heterozygous.
A) the blastomere that was tested had undergone a somatic mutation, making it not representative of the rest of the embryo.
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