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Hybrid Pea plant with yellow round seeds...

Hybrid Pea plant with yellow round seeds (YyRr) is self pollinated. Phenotypic ratio of next generation would be

A

`3:3:1:1`

B

`1:1:1:1`

C

`9:3:3:1`

D

`3:1:3:1`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of determining the phenotypic ratio of the next generation from a hybrid pea plant with yellow round seeds (YyRr) that is self-pollinated, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Traits and Alleles**: - The traits we are dealing with are seed color and seed shape. - Yellow seeds are represented by the allele 'Y' (dominant), and green seeds are represented by 'y' (recessive). - Round seeds are represented by 'R' (dominant), and wrinkled seeds are represented by 'r' (recessive). 2. **Determine the Genotype of the Parent**: - The genotype of the hybrid pea plant is YyRr, meaning it is heterozygous for both traits. 3. **Gamete Formation**: - When the plant self-pollinates, it can produce four types of gametes: - YR (Yellow, Round) - Yr (Yellow, Wrinkled) - yR (Green, Round) - yr (Green, Wrinkled) 4. **Set Up the Punnett Square**: - Create a 4x4 Punnett square to determine the offspring's genotypes by crossing the gametes: ``` YR Yr yR yr --------------------- YR | YYRR YYRr YyRR YyRr Yr | YYRr YYrr YyRr Yyrr yR | YyRR YyRr yyRR yyRr yr | YyRr Yyrr yyRr yyrr ``` 5. **Count the Phenotypes**: - Now, we can count the phenotypes from the Punnett square: - Round Yellow (YYRR, YYRr, YyRR, YyRr): 9 - Round Green (yyRR, yyRr): 3 - Wrinkled Yellow (YYrr, Yyrr): 3 - Wrinkled Green (yyrr): 1 6. **Determine the Phenotypic Ratio**: - The phenotypic ratio of the offspring is: - Round Yellow : Round Green : Wrinkled Yellow : Wrinkled Green = 9 : 3 : 3 : 1 ### Final Answer: The phenotypic ratio of the next generation would be **9:3:3:1**.
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