Biology / Unit 5 Bio 1033 short lesson, about 20 seconds
"Dominant Means More Common"
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The idea
A dominant allele's population frequency is set by selection and history, not by its dominance, so a dominant allele can be rare and a recessive allele common.
In practice
The dominant allele causing Huntington's disease remains rare across human populations despite being dominant.
Where people slip
Dominance is about masking a paired allele in a heterozygote — treating it as population frequency confuses two separate facts.
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