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The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4?
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The number of meiotic and mitotic divisions required to form 8 male ga...
Microspore mother cell undergoes one meiotic division and gives four microspores.
Then, the nucleus within the microspore divides mitotically to form one big vegetative nuclei and one small generative nuclei.
After pollination, the generative cell after entering into the pollen tube divides mitotically to form two non-motile male gametes.
Hence, one meiotic division and two mitotic divisions are required for the formation of a fully mature male gametophyte from microspore mother cell in angiosperm.
So, the correct answer is '1, 2'.
Then, the nucleus within the microspore divides mitotically to form one big vegetative nuclei and one small generative nuclei.
After pollination, the generative cell after entering into the pollen tube divides mitotically to form two non-motile male gametes.
Hence, one meiotic division and two mitotic divisions are required for the formation of a fully mature male gametophyte from microspore mother cell in angiosperm.
So, the correct answer is '1, 2'.
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Most Upvoted Answer
The number of meiotic and mitotic divisions required to form 8 male ga...
The correct option is (d) 2,4.
Explanation:
Male gametophyte development occurs within the anther of the flower. It involves the formation of microspores, which undergo meiosis to form haploid male gametophytes or pollen grains.
Meiotic division:
- Meiosis is a type of cell division that produces four haploid cells from a single diploid cell.
- Meiosis occurs during the formation of microspores from the sporogenous cells within the anther.
- During meiosis, there are two rounds of division - meiosis I and meiosis II.
- Meiosis I separates homologous chromosomes whereas meiosis II separates sister chromatids.
- In male gametophyte development, there is only one meiotic division that produces four haploid microspores.
Therefore, the number of meiotic divisions required to form 8 male gametes during the development of male gametophyte is 2 (4 microspores x 2 rounds of division).
Mitotic division:
- Mitosis is a type of cell division that produces two genetically identical daughter cells from a single parent cell.
- Mitosis occurs during the development of the haploid male gametophyte or pollen grain.
- The haploid microspore undergoes mitotic division to produce a two-celled pollen grain consisting of a vegetative cell and a generative cell.
- The generative cell undergoes another mitotic division to produce two sperm cells, resulting in a mature pollen grain with three cells (two sperm cells and one vegetative cell).
Therefore, the number of mitotic divisions required to form 8 male gametes during the development of male gametophyte is 4 (2 sperm cells per pollen grain x 4 pollen grains).
Hence, the correct option is (d) 2,4.
Explanation:
Male gametophyte development occurs within the anther of the flower. It involves the formation of microspores, which undergo meiosis to form haploid male gametophytes or pollen grains.
Meiotic division:
- Meiosis is a type of cell division that produces four haploid cells from a single diploid cell.
- Meiosis occurs during the formation of microspores from the sporogenous cells within the anther.
- During meiosis, there are two rounds of division - meiosis I and meiosis II.
- Meiosis I separates homologous chromosomes whereas meiosis II separates sister chromatids.
- In male gametophyte development, there is only one meiotic division that produces four haploid microspores.
Therefore, the number of meiotic divisions required to form 8 male gametes during the development of male gametophyte is 2 (4 microspores x 2 rounds of division).
Mitotic division:
- Mitosis is a type of cell division that produces two genetically identical daughter cells from a single parent cell.
- Mitosis occurs during the development of the haploid male gametophyte or pollen grain.
- The haploid microspore undergoes mitotic division to produce a two-celled pollen grain consisting of a vegetative cell and a generative cell.
- The generative cell undergoes another mitotic division to produce two sperm cells, resulting in a mature pollen grain with three cells (two sperm cells and one vegetative cell).
Therefore, the number of mitotic divisions required to form 8 male gametes during the development of male gametophyte is 4 (2 sperm cells per pollen grain x 4 pollen grains).
Hence, the correct option is (d) 2,4.
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The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4?
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The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4?.
The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The number of meiotic and mitotic divisions required to form 8 male gametes during the developing of male gametophyte respectively are a)1,2 b)2,2 c)1,8 d)2,4?.
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