Genetic Variation Flashcards
If a disorder is caused by a recessive allele like cystic fibrosis, how many copies of it do you need to express the disorder?
Two
What are genetic disorders?
Disorders caused by an abnormal gene or chromosome
If you are heterozygous for cystic fibrosis what are you known as?
A carrier
What chance do you have of getting CF if both parents are carriers?
I in 4, or 25%
What does cystic fibrosis affect
Cell membranes
Where does a CF sufferer get thick sticky mucus?
In the air passages and the pancreas
What is polydactyly?
A genetic disorder where babies are born with extra fingers or toes
Is polydactyly a dominant or recessive disorder?
Dominant
How many parents need to have the defective allele to inherit polydactyly?
One
What is the chance of getting polydactyly is one parent has the defective allele?
50%
What is this?
An x ray showing polydactyly
