Card 10 / 16: When closely related individuals mate with each other, or inbreed, the offspring are often not as fit as the offspring of two unrelated individuals. Why?
a.) Close relatives are genetically incompatible.
b.) The DNA of close relatives reacts negatively in the offspring.
c.) Inbreeding can bring together rare, deleterious mutations that lead to harmful phenotypes.
d.) Inbreeding causes normally silent alleles to be expressed.

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