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Which process is responsible for the formation of gametes in sexually reproducing organisms?
Mitosis
Meiosis
Binary fission
Budding
Meiosis
Meiosis is the specialized type of cell division responsible for the formation of gametes (sperm and egg cells) in sexually reproducing organisms. It reduces the chromosome number by half, converting a diploid (2n) parent cell into four genetically distinct haploid (n) daughter cells.
Meiosis is the specialized type of cell division responsible for the formation of gametes (sperm and egg cells) in sexually reproducing organisms. It reduces the chromosome number by half, converting a diploid (2n) parent cell into four genetically distinct haploid (n) daughter cells.
Think of meiosis like a photocopying machine that takes a full dual-language instruction manual (2n), shuffles and edits parts of the pages to make unique versions, and then splits the content exactly in half so that two incomplete manuals can combine later to form a brand new, unique book.
PMAT twice: Prophase, Metaphase, Anaphase, Telophase repeated for Meiosis I and Meiosis II.
2nтЖТn тАФ Reduction of diploid chromosome number to haploid during gamete formation
During meiosis, a single round of DNA replication is followed by two successive nuclear divisions: Meiosis I and Meiosis II. In Meiosis I, homologous chromosomes pair up and undergo crossing over (genetic recombination), which introduces genetic diversity, followed by their separation. Meiosis II resembles mitotic division, where sister chromatids separate, ultimately resulting in four haploid gametes.
Meiosis produces four genetically diverse haploid gametes from one diploid cell.
Crossing over during Prophase I is crucial for genetic variation.
It maintains the constant chromosome number across generations in sexually reproducing organisms.
Promotes genetic diversity via crossing over and independent assortment
Prevents doubling of chromosome number in every generation
Errors in chromosome separation (non-disjunction) can lead to genetic disorders
Slower and more complex process compared to asexual reproduction
Spermatogenesis and Oogenesis in animals
Spore formation in plants and fungi
| Feature | Mitosis | Meiosis |
|---|---|---|
Purpose | Growth, repair, and asexual reproduction | Formation of gametes for sexual reproduction |
Daughter Cell Ploidy | Diploid (2n) | Haploid (n) |
Option A (Mitosis) is incorrect because it results in identical diploid somatic cells.
Option C (Binary fission) and Option D (Budding) are forms of asexual reproduction found in unicellular or lower organisms.
B is correct тАФ Meiosis is the essential cell division process that produces haploid gametes for sexual reproduction.
Remember that somatic cells divide via mitosis maintaining the 2n state, whereas germ cells undergo meiosis to produce n gametes, which is a favorite concept in RRB JE biology questions.
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