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In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?
- a)Only round seeds with green cotyledons
- b)Only wrinkled seeds with yellow cotyledons
- c)Only wrinkled seeds with green cotyledons
- d)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons
Correct answer is option 'D'. Can you explain this answer?
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In Mendel's experiments with garden pea, round seed shape (RR) was dom...
Understanding the Parental Cross
In Mendel's experiments, we start with a parental cross of RRYY (homozygous round seeds with yellow cotyledons) and rryy (homozygous wrinkled seeds with green cotyledons).
F1 Generation Phenotype
The F1 generation from this cross will exhibit the following genotype:
- All offspring will be RrYy (heterozygous for both traits).
Since round (R) and yellow (Y) are dominant traits, all F1 plants will have round seeds and yellow cotyledons.
F2 Generation: The Next Step
When we self-fertilize the F1 generation (RrYy x RrYy), we can use a Punnett square to determine the phenotypes of the F2 generation:
Expected Genotypic Ratio
- The genotypes for the seed shape (R and r) will follow a 3:1 ratio:
- Round (RR, Rr): 3
- Wrinkled (rr): 1
- The genotypes for the cotyledon color (Y and y) will also follow a 3:1 ratio:
- Yellow (YY, Yy): 3
- Green (yy): 1
Combining Traits in F2 Generation
To find the combinations of phenotypes, we can pair the outcomes:
- Round seeds with yellow cotyledons (3/4 for seeds x 3/4 for color) = 9/16
- Round seeds with green cotyledons (3/4 for seeds x 1/4 for color) = 3/16
- Wrinkled seeds with yellow cotyledons (1/4 for seeds x 3/4 for color) = 3/16
- Wrinkled seeds with green cotyledons (1/4 for seeds x 1/4 for color) = 1/16
Conclusion
Thus, the phenotypes in the F2 generation will include:
- Round seeds with yellow cotyledons
- Wrinkled seeds with yellow cotyledons
- Round seeds with green cotyledons
- Wrinkled seeds with green cotyledons
Therefore, the correct answer is option 'D': round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons.
In Mendel's experiments, we start with a parental cross of RRYY (homozygous round seeds with yellow cotyledons) and rryy (homozygous wrinkled seeds with green cotyledons).
F1 Generation Phenotype
The F1 generation from this cross will exhibit the following genotype:
- All offspring will be RrYy (heterozygous for both traits).
Since round (R) and yellow (Y) are dominant traits, all F1 plants will have round seeds and yellow cotyledons.
F2 Generation: The Next Step
When we self-fertilize the F1 generation (RrYy x RrYy), we can use a Punnett square to determine the phenotypes of the F2 generation:
Expected Genotypic Ratio
- The genotypes for the seed shape (R and r) will follow a 3:1 ratio:
- Round (RR, Rr): 3
- Wrinkled (rr): 1
- The genotypes for the cotyledon color (Y and y) will also follow a 3:1 ratio:
- Yellow (YY, Yy): 3
- Green (yy): 1
Combining Traits in F2 Generation
To find the combinations of phenotypes, we can pair the outcomes:
- Round seeds with yellow cotyledons (3/4 for seeds x 3/4 for color) = 9/16
- Round seeds with green cotyledons (3/4 for seeds x 1/4 for color) = 3/16
- Wrinkled seeds with yellow cotyledons (1/4 for seeds x 3/4 for color) = 3/16
- Wrinkled seeds with green cotyledons (1/4 for seeds x 1/4 for color) = 1/16
Conclusion
Thus, the phenotypes in the F2 generation will include:
- Round seeds with yellow cotyledons
- Wrinkled seeds with yellow cotyledons
- Round seeds with green cotyledons
- Wrinkled seeds with green cotyledons
Therefore, the correct answer is option 'D': round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons.
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In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer?
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In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer?.
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?a)Only round seeds with green cotyledonsb)Only wrinkled seeds with yellow cotyledonsc)Only wrinkled seeds with green cotyledonsd)Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledonsCorrect answer is option 'D'. Can you explain this answer?.
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