The Law of Dominance
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State
Mendel's law of dominance holds that in a heterozygote, one allele's trait conceals the other's, so dominant and recessive traits do not blend.
Show
A Yy pea plant shows the dominant yellow-seed trait, with no trace of the recessive green allele.
Watch for
This law describes phenotype in a heterozygote only — incomplete dominance and codominance are exceptions to it, not violations of segregation itself.