Comprehension
Read the passage given below and answer the question.
Mendel’s experiment with tall and dwarf peas, therefore, showed both homozygous and heterozygous zygotes. In pure tall variety, two factors (alleles) remain identical forming TT combination. Similarly, the pure dwarf variety shows tt combination. The hybrid tall plants of the first filial generation (F1) carry two unlike factors, Tt. Mendel in his experiment clearly established the fact that the recessive characters are not expressed in heterozygous condition, but will be expressed in recessive homozygotes (dwarf pea). Ina cross between true-breed contrasting varieties, we can classify F2 progeny (grandchildren grogeny) in two ways, either according to their appearance (phenotype) or according to their genetic composition (genotype). The phenotype classifies thiee individuals as tall out of four, whereas genotype identifies two hybrids (Tt) among the talls. Genotypically the F2 generation is composed of 1 TT, 2 Tt and 1 tt. The terms phenotype and genotype therefore refer to the visible expression of the genes (or Mendelian factors) and the actual genetic constitution of an individual respectively. Mendel discovered the important fact, that in the F1 hybrids, the parental characteristics (or factors or alleles) were not lost or mixed to produce the intermediates, rather the factors or alleles remain segregated. This non-mixing of alleles in the hybrid and their subsequent segregation (equal proportion is maintained in the gamete) is principle of Segregation of Mendel's first law.
Mendel’s experiment with tall and dwarf peas, therefore, showed both homozygous and heterozygous zygotes. In pure tall variety, two factors (alleles) remain identical forming TT combination. Similarly, the pure dwarf variety shows tt combination. The hybrid tall plants of the first filial generation (F1) carry two unlike factors, Tt. Mendel in his experiment clearly established the fact that the recessive characters are not expressed in heterozygous condition, but will be expressed in recessive homozygotes (dwarf pea). Ina cross between true-breed contrasting varieties, we can classify F2 progeny (grandchildren grogeny) in two ways, either according to their appearance (phenotype) or according to their genetic composition (genotype). The phenotype classifies thiee individuals as tall out of four, whereas genotype identifies two hybrids (Tt) among the talls. Genotypically the F2 generation is composed of 1 TT, 2 Tt and 1 tt. The terms phenotype and genotype therefore refer to the visible expression of the genes (or Mendelian factors) and the actual genetic constitution of an individual respectively. Mendel discovered the important fact, that in the F1 hybrids, the parental characteristics (or factors or alleles) were not lost or mixed to produce the intermediates, rather the factors or alleles remain segregated. This non-mixing of alleles in the hybrid and their subsequent segregation (equal proportion is maintained in the gamete) is principle of Segregation of Mendel's first law.
Question: 1
Mendel selected the following pea plants for his experiment:
Mendel selected the following pea plants for his experiment:
Updated On: Apr 26, 2024
- Tall and Dwarf
- All Tall
- All Dwarf
- All Medium
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The Correct Option is A
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The Correct Option is (A): Tall and Dwarf.
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Question: 2
The composition of plants in F2 generation:
The composition of plants in F2 generation:
Updated On: Apr 26, 2024
- 2tt, 2TT and 1tt
- 1Tt, 2TT and 1tt
- 2Tt, 1TT and 1tt
- 1TT, 2Tt and 1tt
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The Correct Option is D
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The Correct Option is (D): 1TT, 2Tt and 1tt.
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Question: 3
Mendel's first law is also called as :
Mendel's first law is also called as :
Updated On: Apr 26, 2024
- Law of Independent assortment
- Law of Segregation
- Law of Unity of gametes
- Law of Impurity
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The Correct Option is B
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The Correct Option is (B): Law of Segregation.
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Question: 4
Mendel’s experiments showed:
Mendel’s experiments showed:
Updated On: Apr 26, 2024
- Only Homozygous plants
- Only Heterozygous plants
- Both Homozygous and Heterozygous plants
- Only Hemizygous plants
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The Correct Option is C
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The Correct Option is (C): Both Homozygous and Heterozygous plants.
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Question: 5
Mendel’s factors are also called:
Mendel’s factors are also called:
Updated On: Apr 26, 2024
- alleles
- phenotypes
- genotypes
- traits
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The Correct Option is A
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The Correct Option is (A): alleles.
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