Gene + Allele - A sequence of bases on a DNA molecule that codes for a protein (polypeptide) is a gene whislt alleles are different versions of the same gene.
Genotype - The alleless an organism has, e.g. Bb, BB or bb for eye colour (b= blue eyes whilst B= Brown eyes
Phenotype - The Characteristics the alleles produce, e.g. brown eyes
Codominant - Alleles that are both expressed in the phenotype - neither one is recessive, e.g. the alleles for haemoglobin
Homozygote - An organism that carries two copies of the same allele, e.g. BB or bb
Heterozygote - An organism that carries two different alleles, e.g. Bb
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