A cross is performed between red and white flowers. All F1 are pink and are self-crossed....
A cross is performed between red and white flowers. All F1 are pink and are self-crossed. 250 progeny are observed, all of which were pink except for 60 red and 60 white. During investigating if flower color follows Mendel’s 1st Law, you calculate a Chi2 value of ___
a. 159.600
b. 23.778
c. 17.330
d. 0.400
e. 212.933
f. 107.320
g. None of the above
Homework Answers
the F1 progeny of the red plants and white plants are all pink, so the alleles shows incomplete dominance
let the alleles be R- red, W- white
RR * WW
RW
RW * RW
| R | W | |
| R | RR ( red) | RW ( pink) |
| W | RW (pink) | WW ( white) |
the expected ratio is red: pink: white=1:2:1
the observed ratio is
red: pink:white=60:130:60=1:2.17:1
| phenotype | Expected (E) | observed (O) | (E-O)^2/E |
| red | 1 | 1 | 0 |
| pink | 2 | 2.17 | 0.014 |
| white | 1 | 1 | 0 |
chi-square value= sum of (E-O)^2/E=0+0.014+0=0.014
so the answer is g) none of the above.
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