Inherited Disorders & Embryo Screening
This lesson covers:
- The idea that an 'inherited disease' is a condition that can be passed on genetically, through the inheritance of certain alleles
- What 'polydactyly' is
- What 'cystic fibrosis' is
What is polydactyly?
A condition in which an individual can be born with extra fingers or toes
A condition in which fatty material builds up in arteries
A condition in which abnormal growth of cells leads to a tumour
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Polydactyly is an example of an 'inherited disease', what does this mean?
It can be inherited from an individual's parents
It is caused by exposure to radiation
It is caused by an unhealthy diet
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Is polydactyly caused by a dominant or a recessive allele?
Dominant
Recessive
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The diagram above shows a Punnett square for the cross between two individuals that are heterozygous for the polydactyly allele.
What is the probability that their offspring will have the condition polydactyly?
25%
50%
100%
75%
0%
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Is cystic fibrosis a dominant or a recessive genetic disorder?
Dominant
Recessive
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Which part of a human body cell is affected by cystic fibrosis?
Nucleus
Mitochondria
Cell membrane
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Which of the following inherited disorders requires a person to inherit two faulty alleles from their parents?
Neither
Cystic fibrosis
Polydactyly
Both
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Cystic fibrosis is an inherited condition that causes:
Blood clots in the brain
Thick, sticky mucus to build up in the lungs and digestive system
Repeated episodes of skin rashes and fever
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