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A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-
[MP PMT 2007]
- a)1 : 1
- b)3 : 1
- c)2 : 1
- d)1 : 2 : 1
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A pure tall and a pure dwarf plant were crossed to produce offsprings....
Case 1: TT x tt
gamets: T. t
x
Tt
ratio of parent gamets - 1 (T) and 1 (t) in every offspring .
case 2: Tt x Tt
gamets:T. t T. t
x
offspring: TT tt. TT. tt
ratios : 1: 1
gamets: T. t
x
Tt
ratio of parent gamets - 1 (T) and 1 (t) in every offspring .
case 2: Tt x Tt
gamets:T. t T. t
x
offspring: TT tt. TT. tt
ratios : 1: 1
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A pure tall and a pure dwarf plant were crossed to produce offsprings....
The cross between a pure tall plant and a pure dwarf plant is a classic example of a monohybrid cross in genetics. Let's break down the process and determine the ratio between true breeding tall and true breeding dwarf offspring.
1. Monohybrid Cross:
- A pure tall plant (TT) is crossed with a pure dwarf plant (tt). The tall plant is homozygous dominant for the tall trait, while the dwarf plant is homozygous recessive for the dwarf trait.
- The offspring of this cross are all heterozygous (Tt) for the tall trait because they inherit one tall allele from the tall parent and one dwarf allele from the dwarf parent.
2. Self-cross of Offspring:
- The heterozygous offspring (Tt) are self-crossed, meaning they are allowed to mate with each other.
- This self-cross results in the following genotypic and phenotypic ratios:
- Genotypic ratio: 1 TT : 2 Tt : 1 tt
- Phenotypic ratio: 3 tall : 1 dwarf
3. Determining True Breeding Offspring:
- True breeding offspring are those that consistently produce the same trait when self-crossed.
- In this case, the true breeding tall offspring are the ones with the genotype TT, as they will always produce tall offspring when self-crossed.
- Similarly, the true breeding dwarf offspring are the ones with the genotype tt, as they will always produce dwarf offspring when self-crossed.
4. Ratio of True Breeding Tall to True Breeding Dwarf:
- Looking at the genotypic ratio of the self-crossed offspring, we can see that there is only 1 TT genotype, which represents the true breeding tall plants.
- On the other hand, there is only 1 tt genotype, which represents the true breeding dwarf plants.
- Therefore, the ratio between true breeding tall to true breeding dwarf is 1:1.
In conclusion, the correct answer is option 'A' (1:1), as the ratio between true breeding tall to true breeding dwarf offspring is 1:1.
1. Monohybrid Cross:
- A pure tall plant (TT) is crossed with a pure dwarf plant (tt). The tall plant is homozygous dominant for the tall trait, while the dwarf plant is homozygous recessive for the dwarf trait.
- The offspring of this cross are all heterozygous (Tt) for the tall trait because they inherit one tall allele from the tall parent and one dwarf allele from the dwarf parent.
2. Self-cross of Offspring:
- The heterozygous offspring (Tt) are self-crossed, meaning they are allowed to mate with each other.
- This self-cross results in the following genotypic and phenotypic ratios:
- Genotypic ratio: 1 TT : 2 Tt : 1 tt
- Phenotypic ratio: 3 tall : 1 dwarf
3. Determining True Breeding Offspring:
- True breeding offspring are those that consistently produce the same trait when self-crossed.
- In this case, the true breeding tall offspring are the ones with the genotype TT, as they will always produce tall offspring when self-crossed.
- Similarly, the true breeding dwarf offspring are the ones with the genotype tt, as they will always produce dwarf offspring when self-crossed.
4. Ratio of True Breeding Tall to True Breeding Dwarf:
- Looking at the genotypic ratio of the self-crossed offspring, we can see that there is only 1 TT genotype, which represents the true breeding tall plants.
- On the other hand, there is only 1 tt genotype, which represents the true breeding dwarf plants.
- Therefore, the ratio between true breeding tall to true breeding dwarf is 1:1.
In conclusion, the correct answer is option 'A' (1:1), as the ratio between true breeding tall to true breeding dwarf offspring is 1:1.
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A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer?
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A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer?.
A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breding dwarf :-[MP PMT 2007]a)1 : 1b)3 : 1c)2 : 1d)1 : 2 : 1Correct answer is option 'A'. Can you explain this answer?.
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