Darwin’s observations of finches indicated descent with

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Darwin’s observations of finches indicated descent with Modification in bills.<span>
They had become adapted to eating different diets, </span>Beak shape of finches is affected by the type of food available to eat. Finches<span> are generally seedeaters and eat a variety of plant seeds. There are times though that their diet will be composed of insects and certain fruits, berries and vegetation.</span>

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A man with a genetic disease marries a woman who does not carry the disease. It is not possible for their sons to have the disea

Nikitich [7]

<h2>X linked dominant </h2>

Explanation:

In X linked dominant if the father carries the abnormal X gene,all of his daughters will have the disease because daughters always inherit their father's X chromosome and if the mother carries the abnormal X gene, half of all their children (daughters and sons) will inherit the disease tendency

In this case man is the one who is diseased and female is normal so daughters in this case will surely inherit the disease
When a cross is made,all the sons are normal whereas daughters are diseased