In peas, green pods(G) are dominant to yellpw pods(g) and inflated pods(I) are dominant to constricted pods(i). Cross an individual heterozygous for both trairs with an individual that has yellow, constricted pods. Using the five steps, show the possible phenotypes and their ratios(as fractions) for this cross. Punnet square.

Question
Asked Nov 2, 2019

In peas, green pods(G) are dominant to yellpw pods(g) and inflated pods(I) are dominant to constricted pods(i). Cross an individual heterozygous for both trairs with an individual that has yellow, constricted pods. Using the five steps, show the possible phenotypes and their ratios(as fractions) for this cross. Punnet square.

 

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Step 1

Given that in peas, green pods(G) are dominant to yellow pods(g) and inflated pods(I) are dominant to constricted pods(i). An individual heterozygous for both traits will have the genotype GgIi  and an individual that has yellow, constricted pods will have the genotype ggii.

Step 2

The Punnett's square is given below:

Ggli
ggii
Parents
X
GI, Gi, gI, gi
gi, gi, gi, gi
Gametes:
|gi
GI
Gi
gI
ggli (yellow
inflated)
ggii (yellow
constricted)
Ggli (green,
inflated)
Ggii (green
constricted)
Ggli(green
inflated)
ggii (yellow
constricted)
Ggii(green,
constricted)
gi
ggli(yellow,
inflated)
Ggii(green
constricted)
|ggli(yellow
inflated)
Ggli(green
inflated)
ggii (yellow,
constricted)
Ggli(green
inflated)
ggli(yellow,
inflated)
gi
Ggii(green,
constricted)
ggii (yellow,
constricted)
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Image Transcriptionclose

Ggli ggii Parents X GI, Gi, gI, gi gi, gi, gi, gi Gametes: |gi GI Gi gI ggli (yellow inflated) ggii (yellow constricted) Ggli (green, inflated) Ggii (green constricted) Ggli(green inflated) ggii (yellow constricted) Ggii(green, constricted) gi ggli(yellow, inflated) Ggii(green constricted) |ggli(yellow inflated) Ggli(green inflated) ggii (yellow, constricted) Ggli(green inflated) ggli(yellow, inflated) gi Ggii(green, constricted) ggii (yellow, constricted)

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Step 3

From the Punnett's square, it can be inferred that there are 4 types of phenotypes, each 4 in number:

GgIi - green, inflated (4)

Ggii- green, contricted (4)

ggIi- yellow, inflated, (4)

ggii- yellow, constricted (4).

So, the phe...

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