Dominant inheritance is when dominant alleles that cause severe defects in people are rarely passed on.
Recessive inheritance is known when a person who carries a recessive allele but does not show the recessive phenotype is known as a carrier for that characteristic. If both parents are carriers, some of their children may receive one defective allele form each parent. This results in the children being homozygous for the recessive allele, and then being affected by the condition. When both parents carry a recessive allele for the same abnormal characteristic, each of their children has a 25% chance of inheriting the disease. Cystic fibrosis is a disorder controlled by one recessive allele.
Recessive inheritance is known when a person who carries a recessive allele but does not show the recessive phenotype is known as a carrier for that characteristic. If both parents are carriers, some of their children may receive one defective allele form each parent. This results in the children being homozygous for the recessive allele, and then being affected by the condition. When both parents carry a recessive allele for the same abnormal characteristic, each of their children has a 25% chance of inheriting the disease. Cystic fibrosis is a disorder controlled by one recessive allele.