Question from H.W

by **dreamtim** » Mon Sep 17, 2012 4:13 pm

A certain vegetable has transparent peel or yellow peel. it is known that two genes affect the peel.
crossbreeding between vegetable from A line with yellow peel and vegetable from C lone also with yellow peel produced only vegetables with yellow peel(F1)
F2 progenies are 453 vegetables with yellow peel and 29 with transparent peel.
Explain the system that determines the peel color.

Those numbers are 1:15, so i thought about dominant epistasis, but now that i think of it there isn't new phenotypes so I don't think this is the answer.

by **Cat** » Mon Sep 17, 2012 8:07 pm

It's 2 unlinked genes, yellow dominant in both. At least one dominant allele in either pair in sufficient to produce yellow phenotype.

F0: AAcc (yellow) x aaCC (yellow)
All F1 are AaCc (yellow)
F2: AACC (yellow), Aacc (yellow), ... (all yellow), and one aacc (clear). Thus 15 yellow : 1 clear

by **dreamtim** » Wed Sep 19, 2012 8:26 am

thank you very much!

Can you share the way of thinking to solve this kind of problames?

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