Meiosis

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What is meiosis?

Back

Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells, each genetically distinct from the parent cell.

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What is the difference between haploid and diploid cells?

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Haploid cells contain one set of chromosomes (n), while diploid cells contain two sets (2n). For example, human gametes are haploid (23 chromosomes), and body cells are diploid (46 chromosomes).

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What are homologous chromosomes?

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Homologous chromosomes are pairs of chromosomes that have the same structure and gene sequence, one inherited from each parent.

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What is the haploid number in humans?

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The haploid number in humans is 23.

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What is the diploid number in humans?

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The diploid number in humans is 46.

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What is crossing over in meiosis?

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Crossing over is the exchange of genetic material between homologous chromosomes during prophase I of meiosis, leading to genetic variation.

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What is the significance of meiosis?

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Meiosis is essential for sexual reproduction, as it produces gametes (sperm and eggs) that contribute to genetic diversity.

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What is Down Syndrome?

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Down Syndrome is a genetic disorder caused by the presence of an extra chromosome 21, leading to developmental and physical challenges.

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What is Trisomy 21?

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Trisomy 21 is the most common form of Down Syndrome, where an individual has three copies of chromosome 21.

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How many chromosomes do male sharks have in their body cells if they have 40 in their sex cells?

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Male sharks have 80 chromosomes in their body cells.