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Heterozygote

Heterozygote cells are diploid or polyploid and have different alleles in a locus (position) on homologous chromosomes. Within most heterozygotes, one of the alleles is dominant (only the trait of the dominant allele shows).

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Quadratic formula

... of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...