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Doll And Hill first evaluated the proposition that smoking was a risk factor for lung cancer in a case-control study (Doll and Hill, 1950). They determine that, of 650 men with lung cancer (cases), 645 had smoked at some time, in comparison with the 625 of the 650 men without lung cancer (control).
a) Draw up a clearly labelled and appropriate 2 x 2 table to show these data.
b) How many times more likely was a smoker to develop lung cancer than a non-smoker?
c) Determine the proportion of lung cancers attributable to the smoking among:
i) smokers and
ii) the whole population.
d) What are these measures known as and how does their interpretation differ?
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At what stage of the cell cycle are the chromosomes satisfactorily condensed that they FIRST become visible under the light microscope.
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When mendel crossed yellow-seeded and green-seeded pea plants, all of offspring were yellow seeded. As he took these yellow-seeded plants and crossed then with green- seeded plants what genotypic ratio is expected.
You cross an M1M2 father with an M2M3 mother and ?nd out that the mean number of nosehairs in dissimilar marker genotypes in their offspring are as follows.
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