• Heredity means the transmission of traits from one generation to another.
• The traits are caused by genes, or hereditary factors. Genes are contained in chromosomes formed from DNA.
• All cells, except for germ cells, have 46 chromosomes. Germ cells have 23 chromosomes.
• A genotype is inherited by an individual.
• A phenotype is an entity influenced by the genotype and the environment, i.e. expression.
• Keywords: heredity, chromosome, allele, genotype, phenotype