Inherited disorder Flashcards
What is an alleles
A different form of the same gene
What is meant by recessive allele
Alleles whose characteristics only show when it is present on both chromosomes
What is an caused by a recessive allele
Cystic fibrosis
What is cystic fibrosis
An inherited disorder of cell membranes
Because it’s recessive what happens to people with only one copy of the allele
They won’t have the disorder, these people are known as carries
For a child to have the disorder what do both parents need
They must be either carriers or they must have the disorder themselves
What is the chance out of 4 that the child has the disorder if both parents are carriers
1 in 4
What is meant by an dominant allele
The one that controls the characteristic whenever it is present
What is caused by dominant allele
Polydactyl
What is polydactyl
An inherited disorder where a baby is born with extra fingers or toes
What is polydactyl caused by
A dominant allele D
What is the chance of a child having the disorder if one parents has one D allele
50% chance
