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When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to it's parents (let grain colour of wheat controlled by three gene pairs )
- a)2/16
- b)20/64
- c)15/64
- d)2/64
Correct answer is option 'D'. Can you explain this answer?
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When a red grain variety of wheat is crossed with another white grain ...
Explanation:
To understand the answer to this question, we need to understand the principles of inheritance and the concept of dominance and recessiveness.
Mendelian Inheritance:
Mendelian inheritance is the basic principle of genetics proposed by Gregor Mendel. According to this principle, traits are controlled by genes, and each gene has two alleles (forms of a gene). When an individual has two different alleles for a gene, one allele may be dominant while the other is recessive.
Dominant and Recessive Alleles:
Dominant alleles are expressed in the phenotype even if only one copy is present. On the other hand, recessive alleles are only expressed if both copies of the gene are recessive.
Crossing Red and White Wheat Varieties:
In this question, a red grain variety of wheat is crossed with a white grain variety. Let's assume that the red grain variety is homozygous dominant (RRRR) for the three gene pairs controlling grain color, and the white grain variety is homozygous recessive (rrrr) for these gene pairs.
F1 Hybrid:
When these two varieties are crossed, the F1 hybrid will be heterozygous (RrRr) for the three gene pairs. In this case, the red grain color is dominant over the white grain color.
F2 Generation:
When the F1 hybrid is selfed, the F2 generation is produced. In the F2 generation, the different possible combinations of alleles can be observed. Let's consider the possible genotypes and phenotypes in the F2 generation:
- RR (red grain) - 1/16
- Rr (red grain) - 4/16
- rR (red grain) - 4/16
- rr (white grain) - 7/16
Phenotypically Resembling Parents:
In this question, we need to calculate the number of offspring in the F2 generation that phenotypically resemble their parents. Since the F1 hybrid has a red grain color, we need to calculate the proportion of offspring with a red grain color.
From the possible genotypes in the F2 generation, we can see that 1/16 have RR genotype, 4/16 have Rr or rR genotype, and 7/16 have rr genotype. Therefore, 5/16 (1/16 + 4/16) offspring have a red grain color, which resembles the parents.
Answer:
Therefore, the correct answer is option 'D' 2/64.
To understand the answer to this question, we need to understand the principles of inheritance and the concept of dominance and recessiveness.
Mendelian Inheritance:
Mendelian inheritance is the basic principle of genetics proposed by Gregor Mendel. According to this principle, traits are controlled by genes, and each gene has two alleles (forms of a gene). When an individual has two different alleles for a gene, one allele may be dominant while the other is recessive.
Dominant and Recessive Alleles:
Dominant alleles are expressed in the phenotype even if only one copy is present. On the other hand, recessive alleles are only expressed if both copies of the gene are recessive.
Crossing Red and White Wheat Varieties:
In this question, a red grain variety of wheat is crossed with a white grain variety. Let's assume that the red grain variety is homozygous dominant (RRRR) for the three gene pairs controlling grain color, and the white grain variety is homozygous recessive (rrrr) for these gene pairs.
F1 Hybrid:
When these two varieties are crossed, the F1 hybrid will be heterozygous (RrRr) for the three gene pairs. In this case, the red grain color is dominant over the white grain color.
F2 Generation:
When the F1 hybrid is selfed, the F2 generation is produced. In the F2 generation, the different possible combinations of alleles can be observed. Let's consider the possible genotypes and phenotypes in the F2 generation:
- RR (red grain) - 1/16
- Rr (red grain) - 4/16
- rR (red grain) - 4/16
- rr (white grain) - 7/16
Phenotypically Resembling Parents:
In this question, we need to calculate the number of offspring in the F2 generation that phenotypically resemble their parents. Since the F1 hybrid has a red grain color, we need to calculate the proportion of offspring with a red grain color.
From the possible genotypes in the F2 generation, we can see that 1/16 have RR genotype, 4/16 have Rr or rR genotype, and 7/16 have rr genotype. Therefore, 5/16 (1/16 + 4/16) offspring have a red grain color, which resembles the parents.
Answer:
Therefore, the correct answer is option 'D' 2/64.
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When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer?
Question Description
When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer?.
When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When a red grain variety of wheat is crossed with another white grain variety a F1-hybrid is produced.On selfing of this F1- hybrid, how many offsprings of F2 - generation resemble phenotypically to its parents (let grain colour of wheat controlled by three gene pairs )a)2/16b)20/64c)15/64d)2/64Correct answer is option 'D'. Can you explain this answer?.
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