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Punnett square help with explaining genetic outcomes

Genetic crosses:
explain and complete the following scenarios using Punnett Squares.
1.Punnett square for seed color(yellow or green)of Mendel's peas.
Show a cross between 2 parents with yellow seeds, both of which are heterozygous. The square will be used to predict how many offspring with green seeds to expect among a population of 1200 offspring. Draw the square and explain the cross.

Solution Preview

Yellow (Y) is dominant over green (G).
<br>Parent with yellow seeds and heterozygous means it has genotype YG.
<br>Since both parents are heterozygous yellow, then they both have YG genotype. Each parent can contribute either Y or ...