## Question

7. If the probability that a bomb would strike in a given area is 0.001 and 500 bombs are dropped, what is the probability that an area would not be struck? What is the probability that two bombs would strike the same area?

8. A couple, who were phenotypically normal, had a child with a recessive disease. They had a second child that at age 1 year had not shown any symptoms of the disease. From surveys of this disease, only 10% of homozygous children do not show any symptoms of the disease by 1 year of age. What is the probability that the child would be homozygous? What is the posterior ability that the child is homozygous? Interpret your results.

18. Construct a table listing the advantages and potential problems in using allozymes, DNA variants, visible polymorphisms, lethals, and polygenic traits to document the amount of genetic variation in a population.

## Solution Preview

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Q6.Let the probability of a couple bearing girls child is g and that for a boy is b.

A couple can produce either a girl or a boy in a single conception.

The combined probability of either boy or a girl being born is 1 if they bear a child, i.e.,

(P = g +b =1).

Now, the probability of child being boy (b) is 0.52. It means that the probability of a child being girl (g) would be: g = 1 - 0.52...

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