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Complete Dominance
A genetic relationship where only the dominant allele is expressed in the phenotype, masking the effect of any recessive allele.
Homozygous
Individuals with two identical alleles for a trait (e.g., AA or aa).
Heterozygous
Individuals with two different alleles for a trait (e.g., Aa).
Phenotypic Expression
The phenomenon where the same phenotype can result from different genotypes.
Co-Dominance
A genetic situation where the heterozygous phenotype displays traits from both alleles distinctly.
Example of Co-Dominance
The AB blood type in humans, where both A and B alleles are expressed equally.
Incomplete Dominance
A type of inheritance where the heterozygous phenotype is a blend of both alleles.
Example of Incomplete Dominance
Crossing a red flower (RR) with a white flower (WW) produces pink flowers (RW).
Diversity of Alleles
The presence of multiple alleles for a gene in a population, leading to genetic variation.
Mendelian Genetics
Genetic principles established by Gregor Mendel that can predict outcomes of genetic crosses.
Thomas Hunt Morgan's Contributions
Morgan used fruit flies to study inheritance patterns and discovered sex-linked traits.
Wild Type
The most common phenotype in a population as studied by Morgan.
Mutant Traits
Variations in phenotypes that differ from the wild type, providing insight into genetic mutations.