dominant allele

What Is Dominance Why Are Some Alleles Dominant And Some Recessive?

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What Is Dominance Why Are Some Alleles Dominant And Some Recessive? Dominant alleles regulate the expression of recessive alleles. … Dominant alleles are found at greater frequency than recessive alleles in populations. Students tend to think that every trait is represented by one gene and that each gene has two and only two alleles. What

Is Down Syndrome Caused By A Dominant Or Recessive Allele?

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Is Down Syndrome Caused By A Dominant Or Recessive Allele? An autosomal recessive disorder requires two copies of the abnormal gene for the disease or trait to develop. But Down Syndrome itself is neither dominant nor recessive. Trisomy 21 is an extra copy of chromosome 21. What allele causes Down syndrome? Most cases of Down