Flashcards
7.2 Genetic disorders
Cards in this deck (12)
- 1How do some people get genetic disorders?Inheritance
- 2What is polydactyly?Having extra fingers or toes
- 3How is polydactyly caused? What is the significance of this?By a dominant allele, therefore meaning it can be passed on by only one parent who has the diroder
- 4What is cystic fibrosis?A disorder of cell membranes
- 5What causes cystic fibrosis? What is the significance of this?A recessive allele, therefore it must be inherited from both parents. It can be passed on by parents who may be carriers of the disorder without actually having the disorder themselves
- 6What is sickle-cell anaemia?A disorder affecting red blood cells
- 7What causes sickle-cell anaemia? What is the significance of this?Caused by a recessive allele
People who are heterozygous for the sickle-cell anaemia gene are less likely to get malaria that people who are homozygous for the dominant gene - 8What are some inherited conditions caused by?The inheritance of abnormal numbers of chromosomes
- 9Give an example of a disease caused by the inheritance of abnormal numbers of chromosomesDown's syndrome is caused by the presence of an extra chromosome
- 10Why do we screen embryos?For the alleles that cause many genetic disorders
- 11Give the stages of embryo screeningDNA is isolated from embryo cells
a gene probe that will bind onto the gene for a specific disorder is produced, The probe usually has a fluorescent chemical attached to it
The probe is added to a mixture containing the DNA sample from the embryo
UV light is used to detect the probe attached to the gene for the disorder - 12What are the concerns about embryo screening?Risk of miscarriages
Reliability of the information for the screening procedure
Decisions about terminating pregnancy
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- GCSE Biology (7 Variation and inheritance) Flashcards on 7.2 Genetic disorders, created by Anisha Rai on 03/05/2016.
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- Anisha Rai
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