a. Most likely genotypes of F1 parents : BbRr x bbrr
Offspring : BbRr : Bbrr : bbRr: bbrr (1:1:1:1)
b. Chi square test
Phenotype |
Observed (O) |
Expected (E) |
(O-E)2/E |
Black rough |
24 |
19.5 |
(24-19.5)2/19.5 =1.04 |
Black smooth |
26 |
19.5 |
=2.17 |
White rough |
23 |
19.5 |
=0.63 |
White smooth |
5 |
19.5 |
=10.78 |
Total |
78 |
78 |
14.62 |
Degrees of freedom = 4 – 1 = 3. The chi-square value falls below 12.838 for a probability value less than .005 or 0.5 % that random chance produced the observed ratio of guinea pigs.
c. From the chi-square value, we can see that it is unlikely that random variations produced the observed ratio. Some other phenomena must be acting.
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