1. Here is the family tree for a family that has a history of cystic fibrosis Give the possible genotypes of all the individuals in the family tree: Let the normal allele = N and the cf allele = n Draw a genetic cross diagram for a cross between 6 and 7 to show possible offspring Cystic fibrosis (cf) is a recessive condition Key Normal male Male with cf Normal female Female with cf 12 3 4567 11 1098

2. Here is the family tree for a family that has a history of cystic fibrosis Cystic fibrosis (cf) is a recessive condition Key Normal male Male with cf Normal female Female with cf 12 3 4567 11 1098 Nn NN or Nn? nnNn nn Nn Give the possible genotypes of all the individuals in the family tree: Let the normal allele = N and the cf allele = n Draw a genetic cross diagram for a cross between 6 and 7 to show possible offspring

3. Here is the family tree for a family that has a history of Huntington’s disease Give the possible genotypes of all the individuals in the family tree: Let the Huntington’s allele = H and the normal allele = h Huntington’s disease is a Dominant condition Key Normal male Male with Huntington’s Normal female Female with Huntington’s 12 3 4567 11 1098

4. Here is the family tree for a family that has a history of Huntington’s disease Give the possible genotypes of all the individuals in the family tree: Let the Huntington’s allele = H and the normal allele = h Huntington’s disease is a Dominant condition Key Normal male Male with Huntington’s Normal female Female with Huntington’s 12 3 4567 11 1098 Hhhh Hh Hh or HH? hh In a dominant condition, two heterozygous parents will produce 3 sufferers: 1 non-sufferer!