Genes - These are made up of DNA. They carry the code for making proteins., DNA - A chemical arranged as a double helix. It is a polymer made up of nucleotides. , Dominant allele - This allele is always expressed, even if only one copy is present., Heterozygous - When both alleles of a gene are different., Phenotype - The observable traits of an organism., Alleles - Different versions of genes. They can be dominant or recessive., Homozygous - When both alleles of a gene are the same., Recessive allele - This allele is only expressed if 2 copies are present., Genotype - The alleles an individual has for a characteristic.,

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