1. You cross a true-breeding parental with yellow flowers andoval petals with a true-breeding parental with purple flowers andround petals. The F1 offspring have purple flowers and ovalpetals.
a. Give the genotypes for the parentals and F1s (you can chooseyour own letters for the alleles):
yellow flower oval petal parental: _____
purple flower round petal parental: _____
purple flower oval petal F1: _______
b. You perform a cross of the F1s, to produce the F2 generation.You get the following counts of plants of four differentphenotypes. Calculate the expected counts for each phenotype.
Phenotype Observed Expected
Purple flower, oval petals 270
Purple flower, round 109
petals
Yellow flower, oval petals 97
Yellow flower, round 24
petals
Total count 500 500
c. Determine the X2 value.
d. How many degrees of freedom? What is the criticalvalue?                 Â
e. Do you accept or reject your hypothesis that this is a basicdihybrid cross?
