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AA Aa
M-> C c F C CC Cc c Cc cc phenotype- 3:1 genotype- 1:2:1
Punnett square
On the outside of the Punnett Square you put the genotype or two alleles of the parents.
The tool used to visualize all of the possible combinations of alleles from parents to offspring is called a punnett square.
Punnett square
Punnett Square.
Punnett Square.
The mother and father both have one mutated cystic fibrosis gene. If the child receives genes from the mother and the father that are both mutated, then the child will develop cystic fibrosis. If the child receives only one chromosome containing the CFTR(cystic fibrosis transport regulator: the gene that is mutated in cystic fibrosis), then the child will not develop CF. He will still have the CF gene, but it is a recessive trait, so you need two of these chromosomes that contain the mutated gene to develop the symptoms of CF and be affected by it. Use a punnet square if you still don't understand :)
Punnett Square :)
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Punnett square