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Variations of Dominance definitions

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  • Complete Dominance
    A genetic scenario where the presence of a dominant allele masks the effect of a recessive allele, resulting in identical phenotypes for homozygous and heterozygous genotypes.
  • Incomplete Dominance
    A genetic condition where heterozygotes display a phenotype intermediate between those of the two homozygotes, reflecting the dosage of dominant alleles.
  • Codominance
    A genetic pattern where two different dominant alleles are both fully and equally expressed in the phenotype, as seen in certain blood types.
  • Phenotype
    The observable traits or characteristics of an organism, determined by its genotype and the interaction of alleles.
  • Genotype
    The genetic makeup of an organism, specifically the combination of alleles present at a given locus.
  • Homozygous
    A genetic state where both alleles at a locus are identical, either both dominant or both recessive.
  • Heterozygous
    A genetic state where two different alleles are present at a locus, one dominant and one recessive.
  • Dominant Allele
    A variant of a gene that expresses its trait in the presence of another allele, masking the effect of a recessive allele.
  • Recessive Allele
    A gene variant whose trait is masked in the presence of a dominant allele and only expressed when homozygous.
  • Punnett Square
    A diagrammatic tool used to predict the possible genetic outcomes and ratios of offspring from a particular cross.
  • ABO Blood Type System
    A classification based on the presence or absence of A and B antigens, determined by codominant alleles IA and IB.
  • IA Allele
    A gene variant responsible for the A antigen in the ABO blood group, showing dominance and codominance with IB.
  • IB Allele
    A gene variant responsible for the B antigen in the ABO blood group, showing dominance and codominance with IA.
  • Blood Type AB
    A phenotype resulting from the presence of both IA and IB alleles, where both A and B antigens are equally expressed.
  • Blood Type O
    A phenotype resulting from the absence of both IA and IB alleles, characterized by the lack of A and B antigens.