Chromosome - A long, coil molecule of DNA that carries genetic information in the form of genes , Codominance  - When both alleles for a gene in the heterozygous organism equally contribute to the phenotype , Diploid cell - A cell that contains a pair of each chromosome type e.g. human diploid cell has 23 pairs of chromosomes , Diploid nucleus - A nucleus that contains two copies of each chromosome (i.e. a full set of chromosomes), Dominant - Describes an allele that is always expressed. Represented by a capital letter. , Gametes - Sex cells (sperm and egg cells) with half the usual number of chromosomes , Gene expression - All specialised cells contain the same set of genes, but only the genes required to code for certain proteins are switched on in any given cell., Genotype - An organism's genetic composition. Describes all alleles , Haploid nucleus - A nucleus that contains a single copy of each chromosome (i.e. half the number of chromosomes) , Heterozygous - When someone has two different alleles of a gene e.g. Ff, Homozygous - When someone has two identical alleles of a gene e.g. ff,

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