Question

a cross is performed between two flowers as shown in the punnett square
if red and yellow are codominant in these flowers, what should be the phenotypic ratio of the offspring from this cross?
1 yellow: 2 yellow and red striped: 1 red
1 yellow: 2 orange: 1 red
3 yellow: 1 red
1 yellow: 3 red

Explanation:

Step1: Fill the Punnett square

$$\begin{array}{|c|c|c|} \hline & Y & y \\ \hline Y & YY & Yy \\ \hline y & Yy & yy \\ \hline \end{array}$$

Step2: Determine phenotypes based on codominance

• \(YY\): yellow (assuming \(Y\) is for yellow allele)
• \(Yy\): yellow and red striped (codominance means both traits show)
• \(yy\): red (assuming \(y\) is for red allele)
• Count: \(YY = 1\), \(Yy = 2\), \(yy = 1\)

Answer:

1 yellow: 2 yellow and red striped: 1 red