A true breeding dominant plant (colored, green) is crossed with a true breeding

Question

A true breeding dominant plant (colored, green) is crossed with a true breeding recessive plant (colorless, yellow). The Fl’s are then intercrossed to give the following F2 results: colored, green (C_G) 180 colored, yellow (C_gg) 28 colorless, green (¢¢G_) 20 colorless, yellow (¢¢gg) 188 Perform a Chi square test to determine whether the genes are linked or unlinked. What is your hypothesis? O The two genes are linked and should have a 9:3:3:1 ratio in the F2’s. O The two genes are unlinked and should have a 1:1:1:1 ratio in the F2's. O The two genes are linked and should have a 1:1:1:1 ratio in the F2’s. O The two genes are unlinked and should have a 9:3:3:1 ratio in the F2's.

Explanation / Answer

Ans is

Two genes are unlinked and should have a 9:3:3:1 ratio in the F2's.

A chi-squared test seeks to distinguish between two distinct possibilities and hence requires two contrasting hypotheses:

A table must be constructed that compares observed and expected frequencies for each possible phenotype

coloured,green coloured,yellow colourless,green colourless, yellow total observed 180 28 20 188 416 expected 416x9/16=234 416x3/16=78 416x3/16=78 416x1/16=26 416

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