Sex cells only contain one allele each, so you need to find out your chances of the baby having CF through punnett squares. You can trace family history through pedigree diagrams.
Monohybrid inheritance – characteristics are controlled by one gene
However, many genes usually control a specific characteristic
Caused by recessive allele – thalassaemia, albinism, phenylketonuria, sickly cell anaemia
Caused by dominant allele – Huntington’s, achondroplasia