Dominance (genetics)
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In genetics, dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome. The mask
Inheritance of dwarfing in maize. Demonstrating the heights of plants from the two parent variations and their F1 heterozygous hybrid (centre)
Zygosity
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Zygosity is the degree to which both copies of a chromosome or gene have the same genetic sequence. In other words, it is the degree of similarity of the alleles in an organism.
Dominance (genetics)
…same gene on the other copy of the chromosome. The masking or overriding variant is said to be dominant and the other recessive. This state of having two different variants of the same gene, one on each copy of the chromosome, is originally caused by a mutation in one of the genes, either new (de novo) or inherited. The…
Homozygous and heterozygous
North Holland Blue youngstock showing the dosage effect of the "barred" trait: periods of pigmented feather growth are shorter in the homozygous cockerel, giving a lighter overall impression; the periods are longer in the hemizygous females, giving a darker overall impression.