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11 June, 07:53

Which is the correct expression of a heterozygous genotype for a recessive genetic disorder?. a A aa Aa

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  1. 11 June, 10:18
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    Answer: Aa

    Explanation: Alleles can be dominant or recessive. A dominant allele is one which has the ability to manifest itself outwardly in the presence of a recessive allele. A dominant allele is usually written in upper case such as A, T, B.

    A recessive allele is one which cannot express itself in the presence of a dominant allele. It is usually written in lower case such as a, t, b. A heterozygous allele has one dominant and one recessive allele, for example Aa, Tt, Bb.
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