In garden pea, round seed shape (R) is dominant over wrinkled (r), and yellow seed colour (Y) is dominant over green (y); the two genes assort independently. A dihybrid F₁ plant of genotype RrYy is self-pollinated to raise 1,600 F₂ seeds. Based on the expected 9:3:3:1 ratio, how many of these F₂ seeds are expected to be wrinkled and yellow?