Which of the following genotypes would most likely lead to a low birth weight and a small placenta?
A) Igf2+/Igf2- but only in female progeny as the Igf2 gene is on the X-chromosome.
B) Igf2+/Igf2+ where neither maternal nor paternal allele is mutated.
C) Igf2+/Igf2- and it doesn't matter which parental source the mutated Igf2- comes from.
D) Igf2+/Igf2- where the mutated Igf2- allele comes from the paternal source.
E) Igf2+/Igf2- where the mutated Igf2- allele comes from the maternal source.
Answer: D
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