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Answer:
heterozygote advantage
Explanation:
An heterozygote advantage is when a heterozygous genotype has a greater aptitude than homozygous genotypes. The specific case of heterozygous advantage over a single locus is known as overdominance. In short, this happens when a disorder is present in a heterozygous population, but this disorder has a great benefit for the genes present in the body.
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Pregnant women have a lot of greater negative risks by smoking. They do include miscarriage. After the baby is born SIDS is at a greater risk as well but the correct answer would be miscarriage. <span />
