Question

round seeds (r) are dominant to wrinkled seeds (r), and yellow seeds (y) are dominant to green seeds (y). what is the expected phenotypic ratio of a cross between an rryy and an rryy individual?
o 1:2:1
o 1:1:1:1
o 9:3:3:1
o 3:1

Explanation:

Step1: Determine gametes

For \(RrYy\): Gametes are \(RY\), \(Ry\), \(rY\), \(ry\). For \(rryy\): Gametes are \(ry\) only.

Step2: Do the cross

Using Punnett - square:

	\(RY\)	\(Ry\)	\(rY\)	\(ry\)

Step3: Count phenotypes

There are 4 possible genotypes. Phenotypes: round yellow (\(RrYy\)) - 1, round green (\(Rryy\)) - 1, wrinkled yellow (\(rrYy\)) - 1, wrinkled green (\(rryy\)) - 1.

Answer:

B. 1:1:1:1