A man and a woman who are both carriers for cystic fibrosis are using in vitro fertilization and preimplantation genetic diagnosis to ensure their offspring will not be afflicted by cystic fibrosis.In the procedure, a cell is removed from the embryo at the eight-cell stage and analyzed for the mutant genes.An embryo that is not homozygous for the mutation is implanted in the woman and develops normally.Because development is normal in the embryo after a cell has been removed, you can conclude that human development

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The fact that an embryo develops normally even after the removal of one cell at the eight-cell stage suggests that human development is regulative during early cleavage stages. This means that each cell is not irreversibly determined to a specific fate at an early stage, but can adjust its fate according to various signals from its surroundings.

A Man and a Woman Who Are Both Carriers for Cystic