How do Igf2 and Igf2r affect parental fitness?
A) Igf2 is a growth-promoting gene, which may reduce a mother's fitness.
B) Igf2 is a growth-inhibiting gene, which may increase a mother's fitness.
C) Igf2r is a growth-inhibiting gene, which may increase a father's fitness.
D) Igf2r is a growth-promoting gene, which may increase a mother's fitness.
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