A red, round, true-breeding tomato is bred with a yellow, oval, true-breeding tomato, and the F1s are testcrossed to a homozygous-recessive tester. This results in the offspring below

Calculate the chi-squared value to test the likelihood of linkage. yellow oval 11 red round 14 yellow round 7 red oval 8


There are 40 total offspring, so if the genes are unlinked the parentals should equal the recombinants at 20 each. The chi-square value is (25-20)2/20 + (15-20)2/20 = 5. With 1 degree of freedom, the P value is less than 0.05, so it is unlikely that the results were from random assortment and likely that the genes are linked.

Biology & Microbiology

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Biology & Microbiology