a plant that has round and yellow seeds (rryy) is crossed with a plant that has round and yellow seeds…

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?\nkey: r = round\nr = wrinkled\ny = yellow\ny = green\n1:16\n3:16\n8:16\n9:16

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?\nkey: r = round\nr = wrinkled\ny = yellow\ny = green\n1:16\n3:16\n8:16\n9:16

Answer

Explanation:

Step1: Determine gametes

The plant with genotype RrYy can produce 4 types of gametes: RY, Ry, rY, ry. When crossing RrYy with RrYy, we use a Punnett - square analysis.

Step2: Set up Punnett - square

A Punnett - square for a di - hybrid cross of RrYy x RrYy has 16 boxes.

Step3: Determine genotypes for round and yellow

The dominant traits are round (R) and yellow (Y). The genotypes for round and yellow seeds are R_Y_. The number of genotypes with R_Y_: RRYY (1/16), RRYy (2/16), RrYY (2/16), RrYy (4/16).

Step4: Calculate the ratio

Adding up the fractions: $\frac{1 + 2+2 + 4}{16}=\frac{9}{16}$.

Answer:

D. 9:16