Darnell and Tinaka Are Each Carriers of an Autosomal Recessive

question 8

Multiple Choice

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.

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