What is the expected number for each phenotype | Homework Helpers

You have two true-breeding tomato plants. One is tall (T) with a bristly stem (B) and white flowers (r). The other is short (t) with a smooth stem (b) and red flowers (R). These plants are crossed, producing a heterozygous F1 generation that is tall with bristly stems and red flowers. You predict that self-fertilization of the F1 generation will result in offspring that inherit their alleles in a manner consistent with simple Mendelian inheritance.

You grow 900 F2 tomato plants and record the following results:
412 Tall bristly plants with red flowers
115 Tall smooth plants with red flowers
130 short bristly plants with red flowers
98 tall bristly plants with white flowers
40 short smooth plants with red flowers
56 tall smooth plants with white flowers
37 short bristly plants with white flowers
12 short smooth plants with white flowers

a. What is the expected number for each phenotype if your hypothesis is correct?

b. How many degrees of freedom are there?

c. Is the hypothesis supported or rejected? Why?