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Dehiscence - The opening of an anther, fruit, or other structure to permit the escape of reproductive bodies.

Dicotyledon - A plant whose embryo has two cotyledons; a dicot.

Diffusion - The movement of a substance from an area of high concentration to an area of lesser concentration as a result of random movement.

Diploid - Having two sets of chromosomes (2n), one inherited from each parent, where (n) represents the number of chromosomes.

Dominance - Refers to the expression of genetically controlled characters (phenotypes) and their corresponding alleles when they are in the heterozygous condition.

Dominant - A gene that exerts its full phenotypic effect regardless of its allelic partner, thus masking the partner's effects.

Dominant allele - In a heterozygote, the allele that is fully expressed in the phenotype.

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