Genetics help?

Question

In pea plants there are two alleles for height T= tall, t = dwarf; two alleles for pea texture S = smooth, s = wrinkled; and two alleles for pea color Y = yellow, and y = green. Upper case letters represent a dominant allele. The following cross is made Tt Ss yy x Tt ss Yy. What proportion of the offspring do you expect to be tall, smooth, and yellow?

Answer 1

Just use a punnet chart?

Answer 2

Here's a Punnett square calculator. Just type in your crosses:

http://www.changbioscience.com/genetics/...

Find all 12 on the chart.