Read the following and answer any four questions: Prashant wanted to find the genotype of a pea plant bearing purple-coloured flowers in his kitchen garden. For this, he crossed purple - flowered plants with a white - flowered plant. As a result, all plants which were produced had purple flowers only. Upon selling these plants, 75 purple flower plants and 25 white flower plants were produced. Now, he can determine the genotype of a purple - flowered plant by crossing it with a white - flowered plant. 1. Which of the following cannot be derived from the crosses done by Prashant? a. Mendel’s law of segregation b. Mendel’s law of dominance c. Mendel’s law of independent assortment d. Both Mendel’s law of segregation and Mendel’s law of independent assortment 2. To determine the genotype of a purple flowered plant, Prashant crossed this plant with a white flowered plant. This cross represents a a. test cross b. dihybrid cross c. reciprocal cross d. trihybrid cross 3. In white flowered plant, allele is expressed in a. heterozygous condition only b. homozygous condition only c. Fଷ generation d. both homozygous and heterozygous condition. 4. The character, i.e., purple colour of the flowers that appeared in the first filial generation is called a. recessive character b. dominant character c. holandric character d. lethal character. 5. Assertion (A): A geneticist crossed two plants and he obtained 50% purple flowered plants and 50% white flowered plants. Reasons (R): Purple coloured flower plant might be heterozygous. a. Both A and R are true and R is the correct explanation of A. b. Both A and R are true but R is not the correct explanation of A. c. A is true but R is false. d. Both A and R are false.6. In Antirrhinum (dog flower), the phenotypic ratio in F2generation for the inheritance of flower colour would be a. 3 : 1 b. 1 : 2 : 1 c. 1 : 1 d. 2: 1 [4
Question
Read the following and answer any four questions: Prashant wanted to find the genotype of a pea plant bearing purple-coloured flowers in his kitchen garden. For this, he crossed purple - flowered plants with a white - flowered plant. As a result, all plants which were produced had purple flowers only. Upon selling these plants, 75 purple flower plants and 25 white flower plants were produced. Now, he can determine the genotype of a purple - flowered plant by crossing it with a white - flowered plant.
- Which of the following cannot be derived from the crosses done by Prashant? a. Mendel’s law of segregation b. Mendel’s law of dominance c. Mendel’s law of independent assortment d. Both Mendel’s law of segregation and Mendel’s law of independent assortment
- To determine the genotype of a purple flowered plant, Prashant crossed this plant with a white flowered plant. This cross represents a a. test cross b. dihybrid cross c. reciprocal cross d. trihybrid cross
- In white flowered plant, allele is expressed in a. heterozygous condition only b. homozygous condition only c. Fଷ generation d. both homozygous and heterozygous condition.
- The character, i.e., purple colour of the flowers that appeared in the first filial generation is called a. recessive character b. dominant character c. holandric character d. lethal character.
- Assertion (A): A geneticist crossed two plants and he obtained 50% purple flowered plants and 50% white flowered plants. Reasons (R): Purple coloured flower plant might be heterozygous. a. Both A and R are true and R is the correct explanation of A. b. Both A and R are true but R is not the correct explanation of A. c. A is true but R is false. d. Both A and R are false.6. In Antirrhinum (dog flower), the phenotypic ratio in F2generation for the inheritance of flower colour would be a. 3 : 1 b. 1 : 2 : 1 c. 1 : 1 d. 2: 1 [4
Solution
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The answer is c. Mendel’s law of independent assortment. This law states that different traits are inherited independently of each other, but in this case, we only have information about one trait - flower color.
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The answer is a. test cross. A test cross is used to determine the genotype of an individual with a dominant phenotype (in this case, purple flowers).
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The answer is b. homozygous condition only. White flower color is a recessive trait, so it can only be expressed when the plant has two copies of the white flower allele.
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The answer is b. dominant character. Purple flower color is a dominant trait, so it appears in the first filial generation even if only one parent has the trait.
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The answer is a. Both A and R are true and R is the correct explanation of A. If the purple flowered plant was heterozygous, it would have one purple allele and one white allele. This would result in a 50% chance of offspring having purple flowers and a 50% chance of offspring having white flowers.
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