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biology

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Help needed to draw a mating diagram where L is the dominant gene for the digestion of lactose and shows the crosses between two heterozygotes and wiht the the phenotypic and genotypic ratio of the offspring in the F1 generation.
I also need to know the phenotypic prportions of the offspring of another cross between a person with lactose intolerance and one who is heterozyous.
any help would be very much appreciated.

http://en.wikipedia.org/wiki/Punnett_square

thank you, this helps a lot.

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