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Two plants of Summer Squash both having ...

Two plants of Summer Squash both having circular fruits are crossed. `F_(1)` plants had discoid fruits. `F_(2)` generation had 3 types of fruits, dicoid, circular and long in the ratio of

A

9:3:4`

B

`9:6:1`

C

`12:3:1`

D

`7:6:3`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the inheritance of fruit shapes in Summer Squash, we need to analyze the genetic basis of the traits involved. ### Step-by-Step Solution: 1. **Identify the Parental Generation (P Generation)**: - We have two plants of Summer Squash, both exhibiting circular fruits. This indicates that circular fruit shape is a dominant trait. 2. **Determine the F1 Generation**: - When these two circular-fruited plants are crossed, the F1 generation exhibits discoid fruits. This suggests that discoid shape is a result of the interaction of alleles from both parents, likely indicating a new phenotype that arises from the combination of the alleles. 3. **Analyze the F2 Generation**: - The F2 generation shows three types of fruits: discoid, circular, and long. The presence of three distinct phenotypes indicates that multiple alleles are involved in determining the fruit shape. 4. **Establish the Phenotypic Ratio**: - The problem states that the F2 generation has a specific ratio of fruit shapes. The typical ratios for such traits, especially when involving dominance and segregation, can often be derived from Mendelian genetics. - The expected phenotypic ratio for a dihybrid cross (which can apply here) is 9:3:4 or 9:6:1 depending on the dominance relationships. 5. **Determine the Correct Ratio**: - From the options provided, we need to find the ratio that matches the expected outcomes. The ratio of 9:6:1 is a common outcome when two traits are involved with one being dominant over the other. 6. **Conclusion**: - Based on the analysis, the correct phenotypic ratio for the F2 generation of Summer Squash is 9:6:1, which corresponds to the ratio of discoid, circular, and long fruits. ### Final Answer: The ratio of discoid, circular, and long fruits in the F2 generation is 9:6:1. ---
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