3.1.2 Inherited disorders Flashcards
What is a genetically inherited disorder?
A condition passed from parents to their offspring in their genes.
Give 3 examples of genetically inherited disorders.
Cystic Fibrosis
Haemophilia
Polydactyly
Describe the symptoms of cystic fibrosis
Lost of thick sticky mucus produced
Difficulty breathing
Difficulty absorbing food
Cystic fibrosis cannot be cured. How can the symptoms be eased?
Physiotherapy to remove mucus
Antibiotic to kill bacterial infections
Cystic fibrosis is caused by a __________ allele
recessive
A person will only have cystic fibrosis if they inherit…
2 copies of the recessive allele.
If a person inherits a dominant cystic fibrosis allele and a recessive cystic fibrosis will they have the disorder?
No but they will be a carrier.
What is meant by a ‘carrier’ of cystic fibrosis?
A person who does not have cystic fibrosis but carries one copy of the recessive allele so could pass it on to their children.
Would the following have cystic fibrosis, not have cystic fibrosis or be a carrier of cystic fibrosis?
CC
CC = 2 dominant alleles so would not have cystic fibrosis
Would the following have cystic fibrosis, not have cystic fibrosis or be a carrier of cystic fibrosis?
cc
cc = 2 recessive allele so would have cystic fibrosis
Would the following have cystic fibrosis, not have cystic fibrosis or be a carrier of cystic fibrosis?
Cc
Cc = 1 dominant and 1 recessive allele so no cystic fibrosis but would be a carrier.
What is polydactyly?
A disorder that results in a child being born with extra digits on their hands or feet.
Polydactyly is caused by a _________ allele
dominant allele
