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(a) Define law of dominance.
(b) Grey body is dominant over black body in fruit flies. Starting with a pure breeding grey fly (that is one whose ancestors have all been grey) and an ebony fly, draw a diagram to show the parental F1 and F2 generations. Use the symbol e for ebony and E for grey alleles. [5 MARKS]

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Solution

a) 2 Marks
b) 3 Marks

(a) Law of dominance states that when two different factors or genes of a pair of contrasting characters are present in an organism, one of them is expressed in F1 generation and is termed as dominant character and the other character which remains suppressed is the recessive character.

(b)



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