Question

12.25 Mendel formulated the law of independent assortment as his second law of inheritance. It involves two genes independently segregated during reproduction, each independently determining one aspect of the phenotype. In one experiment, Mendel crossed pea plants producing yellow, round seeds with pea plants producing green, wrinkled seeds. The first generation resulted in only plants producing yellow, round seeds. Self-crossing of the F1 yielded the following phenotypes in F2: Assuming two independent genes, each with a dominant and a recessive alleles, we would expect to find a 9:3:3:1 phenotypic ratio.

a) Are the conditions for a chi-square goodness of fit test satisfied?

b) What are the null and alternative hypotheses for this test?

c) What are the expected counts under the null hypothesis? Phenotype Y Round Y wrinkled G Round G Wrinkled Observed Expected

d)

The chi-square statistic for this test is χ2 = 0.47. Use Table D to find the P-value. What can you conclude? Do the data agree with Mendel’s second law of genetic inheritance?

Answer 1

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