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what is The allele that will always show up if it is present
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That is called a dominant allele.
Definition: a dominant allele produces its trait (phenotype) whenever it is present — including in a heterozygote (one dominant + one recessive allele). The recessive allele’s trait appears only when two recessive alleles are present (homozygous recessive).
Brief example: in Mendel’s peas the allele for purple flowers (P) is dominant over white (p), so Pp and PP plants have purple flowers.
Caveats: not all genes follow simple dominance — there are cases of incomplete dominance, codominance, variable penetrance, and variable expressivity, where the phenotype is not strictly “always” shown.
Definition: a dominant allele produces its trait (phenotype) whenever it is present — including in a heterozygote (one dominant + one recessive allele). The recessive allele’s trait appears only when two recessive alleles are present (homozygous recessive).
Brief example: in Mendel’s peas the allele for purple flowers (P) is dominant over white (p), so Pp and PP plants have purple flowers.
Caveats: not all genes follow simple dominance — there are cases of incomplete dominance, codominance, variable penetrance, and variable expressivity, where the phenotype is not strictly “always” shown.
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