Class 10 Exam > Class 10 Questions > What is the genotypic ratio in Mendels F2 gen...
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What is the genotypic ratio in Mendel's F2 generation for a single trait?
- a)3:1
- b)1:2:1
- c)9:3:3:1
- d)2:2
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the genotypic ratio in Mendels F2 generation for a single trai...
Understanding Mendel's F2 Generation
Mendel's experiments with pea plants laid the foundation for genetics, especially in understanding inheritance patterns.
Single Trait Inheritance
When studying a single trait, Mendel observed the inheritance of dominant and recessive alleles. In his experiments, he crossed homozygous parents:
- P Generation: One parent with two dominant alleles (AA) and another with two recessive alleles (aa).
- F1 Generation: All offspring (Aa) displayed the dominant trait.
F2 Generation Results
When F1 plants were self-fertilized, the F2 generation emerged, revealing a classic 3:1 phenotypic ratio of dominant to recessive traits:
- Phenotypic Ratio: 3 dominant (AA or Aa) : 1 recessive (aa)
However, when considering the genotypes:
- Genotypic Ratio: This includes:
- 1 homozygous dominant (AA)
- 2 heterozygous (Aa)
- 1 homozygous recessive (aa)
Thus, the genotypic ratio for the F2 generation is:
- 1 AA : 2 Aa : 1 aa
Correct Answer: 1:2:1
This corresponds to option 'B'. The 1:2:1 ratio illustrates the distribution of genotypes resulting from the segregation of alleles during meiosis.
Conclusion
Mendel's work exemplifies the foundational principles of genetic inheritance, with the F2 generation showcasing the predictable ratios of genotypes and phenotypes, crucial for understanding heredity.
Mendel's experiments with pea plants laid the foundation for genetics, especially in understanding inheritance patterns.
Single Trait Inheritance
When studying a single trait, Mendel observed the inheritance of dominant and recessive alleles. In his experiments, he crossed homozygous parents:
- P Generation: One parent with two dominant alleles (AA) and another with two recessive alleles (aa).
- F1 Generation: All offspring (Aa) displayed the dominant trait.
F2 Generation Results
When F1 plants were self-fertilized, the F2 generation emerged, revealing a classic 3:1 phenotypic ratio of dominant to recessive traits:
- Phenotypic Ratio: 3 dominant (AA or Aa) : 1 recessive (aa)
However, when considering the genotypes:
- Genotypic Ratio: This includes:
- 1 homozygous dominant (AA)
- 2 heterozygous (Aa)
- 1 homozygous recessive (aa)
Thus, the genotypic ratio for the F2 generation is:
- 1 AA : 2 Aa : 1 aa
Correct Answer: 1:2:1
This corresponds to option 'B'. The 1:2:1 ratio illustrates the distribution of genotypes resulting from the segregation of alleles during meiosis.
Conclusion
Mendel's work exemplifies the foundational principles of genetic inheritance, with the F2 generation showcasing the predictable ratios of genotypes and phenotypes, crucial for understanding heredity.
Community Answer
What is the genotypic ratio in Mendels F2 generation for a single trai...
In Mendel's experiments, the F2 generation for a single trait resulted from crossing two F1 heterozygous individuals (e.g., Tt x Tt). The genotypic ratio for the F2 generation is: - 1:2:1
This ratio represents:
- 1 homozygous dominant (TT)
- 2 heterozygous (Tt)
- 1 homozygous recessive (tt)
This occurs due to the combination of alleles, where each parent contributes one allele, resulting in the possible combinations of TT, Tt, and tt.
This ratio represents:
- 1 homozygous dominant (TT)
- 2 heterozygous (Tt)
- 1 homozygous recessive (tt)
This occurs due to the combination of alleles, where each parent contributes one allele, resulting in the possible combinations of TT, Tt, and tt.
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What is the genotypic ratio in Mendels F2 generation for a single trait?a)3:1b)1:2:1c)9:3:3:1d)2:2Correct answer is option 'B'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about What is the genotypic ratio in Mendels F2 generation for a single trait?a)3:1b)1:2:1c)9:3:3:1d)2:2Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the genotypic ratio in Mendels F2 generation for a single trait?a)3:1b)1:2:1c)9:3:3:1d)2:2Correct answer is option 'B'. Can you explain this answer?.
What is the genotypic ratio in Mendels F2 generation for a single trait?a)3:1b)1:2:1c)9:3:3:1d)2:2Correct answer is option 'B'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about What is the genotypic ratio in Mendels F2 generation for a single trait?a)3:1b)1:2:1c)9:3:3:1d)2:2Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the genotypic ratio in Mendels F2 generation for a single trait?a)3:1b)1:2:1c)9:3:3:1d)2:2Correct answer is option 'B'. Can you explain this answer?.
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