Final answer:
When true-breeding plants with green seeds (gg) and true-breeding plants with yellow seeds (Gg) are crossed, there is a 50% chance of the offspring having green seeds (Gg) and a 50% chance of the offspring having yellow seeds (gg).
Step-by-step explanation:
When true-breeding plants with green seeds (gg) and true-breeding plants with yellow seeds (Gg) are crossed, the possible genotypes of the offspring will be Gg or gg.
The genotype Gg represents green seeds, while gg represents yellow seeds. To determine the percentage chances of each genotype, we can use a Punnett square.
When the Gg parent is crossed with the gg parent, the square will show a 50% chance of Gg (green seeds) and a 50% chance of gg (yellow seeds).
Therefore, the percentage chance of each offspring is 50% green seeds (Gg) and 50% yellow seeds (gg).