L3 - Inheritance

• Allele


  A different form of the same gene. Genes come in pairs.
• Dominant allele


  An allele which is always expressed if present in the genotype
• A genotype always contains two alleles
• Recessive allele


  An allele which is only expressed if there are no dominant alleles present in the genotype
• Homozygous dominant (GG)


  An individual who has two dominant alleles
• Heterozygous (Gg)


  An individual with a dominant and a recessive allele
• Homozygous recessive (gg)


  An individual with two recessive alleles
• Phenotype


  The physical feature that is expressed