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A multiple allelic series is known to govern the intensity of pigmentation in the mouse...

A multiple allelic series is known to govern the intensity of pigmentation in the mouse such that:
D=full colour
d=dilute colour
dl=lethal when homozygous.
The dominance order D>d>dl. A full coloured mouse carrying the lethal is mated to a dilute coloured mouse also carrying the lethal.The F1 is backcrossed to the dilute parents.
a.What phenotypic ratio is expected in the viable backcross progeny?
b.What percentage of the full coloured backcross progeny carry lethal allel?
c.What fraction of the dilute coloured projeny carry the lethal allel?

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