Inheritance - family trees Flashcards
1
Q
what does a family tree only show?
A
phenotypes. it doesn’t show genotypes
2
Q
give one piece of evidence that cystic fibrosis is caused by recessive allele
A
look for parents of someone with cystic fibrosis. this means parents are carriers and cystic fibrosis allele must be recessive. if it was dominant at least one of the parents would need to have cystic fibrosis in order to pass on to the child
