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

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The most likely explanation is that the tested blastomere underwent a somatic mutation, which can occur during early embryonic development and result in genetic differences within a single embryo. This means that the sampled cell may not have been representative of the rest of the embryo, leading to a misdiagnosis of the genetic status of the embryo.

Darnell and Tinaka Are Each Carriers of an Autosomal Recessive