Question

a plant that has round and yellow seeds (rryy) is crossed with a plant that has round and yellow seeds (rryy). what is the ratio of the offspring that will have round and yellow seeds?
key: r = round
r = wrinkled
y = yellow
y = green
1:16
3:16
8:16
9:16

Explanation:

Step1: Determine gametes

For \(RrYy\) plant, gametes are \(RY, Ry, rY, ry\).

Step2: Create Punnett square

	\(RY\)	\(Ry\)	\(rY\)	\(ry\)
\(Ry\)	\(RRYy\)	\(RRyy\)	\(RrYy\)	\(Rryy\)
\(rY\)	\(RrYY\)	\(RrYy\)	\(rrYY\)	\(rrYy\)
\(ry\)	\(RrYy\)	\(Rryy\)	\(rrYy\)	\(rryy\)

Step3: Count round - yellow (\(R - Y -\))

\(RRYY (1)\), \(RRYy (2)\), \(RrYY (2)\), \(RrYy (4)\). Total \(9\) out of \(16\).

Answer:

\(9:16\)