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Huntingtons disease is a genetic disorder affecting the ........ . It is incurable leading to.......... .
Central nervous system. premature death
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Huntingtons disease damages the brains nerve cells. what are the symptoms of this?
involentry movement, clumsiness, memory loss, mood changes and inability to concentrate.
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Is huntingtons disease dominant or recessive? explain .
dominant. Only one parent has to pass on the gene for the child to inherit it.
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cystic fibrosis affects ........ . causing a ....,....,..... especially in the ...,.... and ....... .
cell membranes. thick,sticky mucus. lungs, gut and pancreas.
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What are the symptoms of cystic fibrosis?
weight loss, difficulty in breathing, chest infecting and difficulty digesting food.
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Is cystic fibrosis dominant or recessive? explain.
recessive. if only one allele of CF is possessed you will not develop the disease but will be a carrier. both parents must carry the disease in order for the child to inherit the disease.
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what is a chromosome?
a long strand of DNA
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What are alleles?
different versions of the same gene.
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what is it meant by a carrier of a genetic disease?
someone who could possibly pass on the disease to a child but does not have it themselves.
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what is a phenotype?
the characteristics that an individual shows.
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What are adults tested for? why?
To see if a disease-causing allele is in their cells and decide to have children or not. They may choose to not have children or adopt or have children and take a risk.
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what are children tested for? why?
to see if they have a disease causing genes, so that possible preventitive measures can be taken. and to insure no negative affect will come from a prescribed drug.
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What are feotuses tested for? what procedures must be taken? are there any ethical issues?
the fluid around the foetus or placenta can be tested on for faulty alleles. (small risk of miscarriage) procedures; terminate pregnancy?(ethically wrong?) tell family members? (may affect relationships?)
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what is FALSE POSITIVE and FALSE NEGATIVE?
FP: test result shows positive, in reality it is negative. FN: test result shows negative, in reality it is positive.
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what are the three stages of in vitro fertilisation (IVF)?
1) ova are harvested from the mother and fertilised. 2) embryo are tested on for faulty gene. 3) healthy embryos are implanted into the mother- pregnancy proceeds as normal.
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the procedure for embryo selection is called; pre-implantation genetic diagnosis. what are the 2 staged within PGT?
1) after fertilisation the embryos are allowed to divide into 8 before the cell is removed from each one for testing. 2) the cells are tested to see if they carry alleles for a specific genetic disorder.
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what is a stem cell?
an unspecialised cell.
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a stem cell taken from bone marrow is what type of cell?
an adult stem cell
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6MQ:linda: every pregnancy should be tested on for HD ad aborted if the condition present. why is Linda's response unethical?
is an incurable genetic disorder that causes suffering, doesn't develop until later life, unethical to abort feotus as it would lead a normal life if allowed to develop as normal, genetic test may be incorrect; false positive- healthy feotus aborted
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explain why the sperm is said to 'decide' the sex of the pregnancy?
half of the sperm carry an x chromosome and half of the sperm carry a y chromosome. all the eggs(ova) carry an x chromosome, so which type of sperm fertilises the egg decides weather the baby is a boy(XY) or a girl(XX)
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what is the meaning of genotype?
genetic make up; types of alleles present in the nucleus.
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Other cards in this set

Card 2

Front

Huntingtons disease damages the brains nerve cells. what are the symptoms of this?

Back

involentry movement, clumsiness, memory loss, mood changes and inability to concentrate.

Card 3

Front

Is huntingtons disease dominant or recessive? explain .

Back

Preview of the front of card 3

Card 4

Front

cystic fibrosis affects ........ . causing a ....,....,..... especially in the ...,.... and ....... .

Back

Preview of the front of card 4

Card 5

Front

What are the symptoms of cystic fibrosis?

Back

Preview of the front of card 5
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