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A plant is RRYy. Its gametes come from product(g[:2], g[2:]).
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A plant is RRYy. Its gametes come from product(g[:2], g[2:]). How many gametes does the list hold, and how many of them are different?
Need a reminder? The key ideaShow
With two genes, product("Rr", "Yy") gives the four gametes RY, Ry, rY and ry. Four gametes meet four in 16 boxes; each gene of the child is sorted on its own. RrYy with RrYy gives 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green. A test cross with rryy shows the hidden letters of a dominant-looking plant.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The list. product("RR", "Yy") gives RY, Ry, RY and Ry: items.
Step 2. The different ones. Only RY and Ry: .
Step 3. Why. A plant pure for one gene, RR, can only pass on R. Only the colour gene gives a choice.
Answer: listed, different.
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