Biology for IGCSE & O level - Inheritance (Section 11 - No. 35)

What is the phenotypic ratio expected from a cross between two heterozygous individuals (Aa x Aa)?

1:1

3:1

1:2:1

9:3:3:1

The phenotypic ratio is 3:1 where 3 express the dominant trait and 1 the recessive trait