Answer:
1. a. 9/16 will have purple flowers and round seeds.
Explanation:
If purple flowers (P) and round seeds (R) are the dominant traits and both genes follow Mendel's principles, the cross between two heterozygous (PpRr) will always produce the following proportions:
9/16 of both dominant traits (in this example, purple flowers, and round seeds)
3/16 of one dominant trait and one recessive (For example, non-purple flowers and round seeds)
9/16 of the other dominant trait and the other recessive one (purple flowers and non-round seeds)
1/16 of double recessive (non-purple flowers and round seeds).
In the attached Punnett Square is this cross, and it can be seen genotypic and phenotypic proportions.
