A germ-line mutation in one of the genes implicated in the cancer occurred in an ancestor.
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The answer should be 
Since the pedigree has two different letters, it will have one letter of each, but the DNA will still be A.
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Mosquitoes have thin, long bodies and three pairs of extremely long legs. They have scales along the veins of their wings and long beak-like, sharp sucking mouth parts called a proboscis. These two features distinguish mosquitoes from other flies. Mosquitoes also have feathery or hairy antennae.
A great amount of Antarctic animals feed on them. Whales, penguins, fish, birds, etc. They eat phytoplankton.
