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F(2) generation of a dihybrid cross poss...

`F_(2)` generation of a dihybrid cross possesses one or both the dominant traits in proportion of

A

`1//6`

B

`6//16`

C

`9//16`

D

`15//16`

Text Solution

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The correct Answer is:
To solve the question regarding the proportion of dominant traits in the F2 generation of a dihybrid cross, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Dihybrid Cross**: A dihybrid cross involves two traits, each represented by two alleles. For example, consider traits for seed shape (Round - R, Wrinkled - r) and seed color (Yellow - Y, Green - y). The parental generation (P) can be represented as RRYY (homozygous round yellow) crossed with rryy (homozygous wrinkled green). 2. **Determine the F1 Generation**: The F1 generation will be heterozygous for both traits (RrYy) when the two homozygous parents are crossed. All F1 offspring will exhibit the dominant traits (Round and Yellow). 3. **Perform the F2 Generation Cross**: To obtain the F2 generation, the F1 individuals (RrYy) are crossed with each other. This results in a 16-cell Punnett square, which helps visualize the combinations of alleles. 4. **Analyze the F2 Generation Results**: The phenotypic ratio from the dihybrid cross (RrYy x RrYy) is typically 9:3:3:1. This means: - 9 offspring will show both dominant traits (Round Yellow), - 3 offspring will show one dominant trait (Round Green), - 3 offspring will show the other dominant trait (Wrinkled Yellow), - 1 offspring will show both recessive traits (Wrinkled Green). 5. **Count the Dominant Traits**: In total, we have: - 9 (Round Yellow) + 3 (Round Green) + 3 (Wrinkled Yellow) = 15 offspring showing at least one dominant trait. - Only 1 offspring shows both recessive traits (Wrinkled Green). 6. **Calculate the Proportion**: Out of 16 total offspring, 15 exhibit at least one dominant trait. Thus, the proportion of the F2 generation that possesses one or both dominant traits is 15 out of 16. ### Final Answer: The F2 generation of a dihybrid cross possesses one or both the dominant traits in the proportion of **15:16**. ---
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