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In theory, when a nondisjunction for chromosome 18 occurs during meiosis I, four gametes can be produced. If these gametes are fertilized with unaffected gametes from the second parent, what observations would you make concerning the resulting embryos? a) Two of the embryos will be trisomic for chromosome 18, and two will contain a single copy of chromosome 18. b) All four possible embryos will be trisomic for chromosome 18. c) Two of the embryos will be trisomic for chromosome 18, and two will be normal. d) Two of the embryos will be normal, and two will contain a single copy of chromosome 18.
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