Question 1A flowering plant has 2n = 24 chromosomes.a) The number of chromosomes present in a pollen mother cell. [1]b) The number of chromosomes present in each microspore immediately after meiosis. [1]c) The number of meiotic divisions required to produce 100 pollen grains, assuming each pollen mother cellproduces four microspores. [2]d) The total number of mitotic divisions required for the development of 100 mature male gametophytes ifeach microspore undergoes one mitotic division to form the vegetative and generative cells and thegenerative cell subsequently undergoes one mitotic division to form two male gametes. [2]

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a) Chromosomes in a pollen mother cellA pollen mother cell (PMC) is diploid (2n).= 24 Chromosome b)Chromosomes in each microspore after meiosis Meiosis reduces the chromosome number to haploid (n). = 12 Chromosome c) Meiotic divisions required to produce 100 pollen grains One pollen mother cell...
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a) Chromosomes in a pollen mother cellA pollen mother cell (PMC) is diploid (2n).= 24 Chromosome b)Chromosomes in each microspore after meiosis Meiosis reduces the chromosome number to haploid (n). = 12 Chromosome c) Meiotic divisions required to produce 100 pollen grains One pollen mother cell undergoes one meiosis and produces 4 microspores. Number of PMCs required: Each PMC undergoes one meiotic division. Answer: 25 d) Total mitotic divisions for 100 mature male gametophytes Each microspore undergoes: 1st mitotic division → vegetative cell + generative cell 2nd mitotic division of generative cell → 2 male gametes So, 2 mitotic divisions per microspore. For 100 microspores: 100×2= 200mitotic division read less
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A flowering plant has 2n=24 chromosomes. So, n=12. a) Chromosomes in a pollen mother cell (PMC): A pollen mother cell is diploid. Hence, it will have 2n=24 chromosomes. Answer: 24 b) Chromosomes in each microspore after meiosis: Meiosis reduces chromosome number to half. Each...
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A flowering plant has 2n=24 chromosomes. So, n=12. a) Chromosomes in a pollen mother cell (PMC): A pollen mother cell is diploid. Hence, it will have 2n=24 chromosomes. Answer: 24 b) Chromosomes in each microspore after meiosis: Meiosis reduces chromosome number to half. Each microspore will have n=12 chromosomes. Answer: 12 c) Number of meiotic divisions to produce 100 pollen grains: Each pollen mother cell undergoes meiosis → produces 4 microspores (pollen grains). To produce 100 pollen grains: 1004=25meioticdivisions Answer: 25 d) Total mitotic divisions for 100 mature male gametophytes: Each microspore undergoes 1 mitotic division → forms vegetative cell + generative cell. Generative cell undergoes 1 more mitotic division → forms 2 male gametes. So, each microspore requires 2 mitotic divisions in total. For 100 microspores (pollen grains): 100×2=200mitoticdivisions Answer: 200 read less
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Here are the solutions to the questions presented in the image:Direct Answers A) 24 B) 12 C) 25 D) 200 Detailed Explanations A) The number of chromosomes present in a pollen mother cell. Explanation: A pollen mother cell (PMC) is a vegetative/somatic cell of the anther and is diploid ((2n)). Since the...
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Here are the solutions to the questions presented in the image:Direct Answers A) 24 B) 12 C) 25 D) 200 Detailed Explanations A) The number of chromosomes present in a pollen mother cell. Explanation: A pollen mother cell (PMC) is a vegetative/somatic cell of the anther and is diploid ((2n)). Since the plant has (2n = 24), the PMC also contains 24 chromosomes. B) The number of chromosomes present in each microspore immediately after meiosis.Explanation: Meiosis is a reductional division that halves the chromosome number. The diploid pollen mother cell ((2n = 24)) undergoes meiosis to form haploid ((n)) microspores. Number of Chromosomes = 24/2 = 12 C) The number of meiotic divisions required to produce 100 pollen grains.Explanation: One pollen mother cell undergoes 1 meiotic division to produce 4 microspores (which develop into 4 pollen grains). 100/4 = 25 D) The total number of mitotic divisions required for the development of 100 mature male gametophytes.Explanation: According to the problem statement, each individual microspore requires two mitotic divisions to become a mature male gametophyte:First mitosis: The microspore divides to form a vegetative cell and a generative cell (1 division).Second mitosis: The generative cell divides to form two male gametes (1 division). Total for 100 gametophytes: 100 x 2 = 200 read less
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a) 24 A pollen mother cell (PMC) is a diploid cell (2n), so it contains the full set of chromosomes (2n = 24). b) 12 Microspores are produced via meiosis, which halves the chromosome number (n = 12). c) 25 Step 1: Each meiotic division of a single PMC produces 4 microspores (pollen...
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a) 24 A pollen mother cell (PMC) is a diploid cell (2n), so it contains the full set of chromosomes (2n = 24). b) 12 Microspores are produced via meiosis, which halves the chromosome number (n = 12). c) 25 Step 1: Each meiotic division of a single PMC produces 4 microspores (pollen grains). Step 2: To calculate the divisions needed: frac{100 \text{ pollen grains}}{4 \text{ microspores per division}} = 25meiotic divisions. d) 200 Step 1: 1st Mitosis: Each of the 100 microspores undergoes 1 mitotic division to form a vegetative cell and a generative cell. \text{Divisions} = 100 \times 1 = 100 Step 2: 2nd Mitosis: Each of the 100 generative cells undergoes 1 mitotic division to form two male gametes. \text{Divisions} = 100 \times 1 = 100 Step 3: Total Mitotic Divisions: text{Total} = 100 + 100 = 200 read less
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flowering plant has 2n = 24 chromosomes.So:2n = 24n = 24 ÷ 2 = 12(a) Chromosomes in pollen mother cellPollen mother cell is diploid (2n).Therefore:2n = 24✅ Answer: 24 chromosomes(b) Chromosomes in each microsporeMeiosis reduces the chromosome number to half.24 ÷ 2 = 12✅ Answer: 12 chromosomes(c)...
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flowering plant has 2n = 24 chromosomes.So:2n = 24n = 24 ÷ 2 = 12(a) Chromosomes in pollen mother cellPollen mother cell is diploid (2n).Therefore:2n = 24✅ Answer: 24 chromosomes(b) Chromosomes in each microsporeMeiosis reduces the chromosome number to half.24 ÷ 2 = 12✅ Answer: 12 chromosomes(c) Meiotic divisions needed for 100 pollen grainsRemember:1 pollen mother cell → 4 microspores → 4 pollen grainsFor 100 pollen grains:100 ÷ 4 = 25So, 25 pollen mother cells are needed.Each cell undergoes 1 meiosis.✅ Answer: 25 meiotic divisions(d) Mitotic divisions for 100 mature male gametophytesEach microspore undergoes:1st mitosis → Vegetative cell + Generative cellThen:2nd mitosis → Generative cell forms 2 male gametesSo, 2 mitotic divisions per microspore.For 100 microspores:100 × 2 = 200 read less
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Q1 Answers a) 24 chromosomes. b) 12 chromosomes. c) Each pollen mother cell produces 4 microspores: 100÷4=25100\div4=25 Answer: 25 meiotic divisions. d) Each microspore needs 2 mitotic divisions: 100×2=200100\times2=200 Answer: 200 mitotic divisions.
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Q1 Answers a) 24 chromosomes. b) 12 chromosomes. c) Each pollen mother cell produces 4 microspores: 100÷4=25100\div4=25 Answer: 25 meiotic divisions. d) Each microspore needs 2 mitotic divisions: 100×2=200100\times2=200 Answer: 200 mitotic divisions. read less
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