Review #9: Meiosis and Karyotypes

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What is meiosis?

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Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four genetically diverse gametes (sperm or eggs).

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What is a karyotype?

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A karyotype is a visual representation of an individual's chromosomes, arranged in pairs and organized by size and shape.

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How many chromosomes do humans have?

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Humans have 46 chromosomes, arranged in 23 pairs.

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What is the purpose of meiosis?

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The purpose of meiosis is to produce gametes for sexual reproduction, ensuring genetic diversity.

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What is crossing over?

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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 fertilization?

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Fertilization is the process where a sperm cell and an egg cell unite to form a zygote.

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What is a zygote?

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A zygote is the fertilized egg that results from the union of a sperm and an egg, containing a complete set of chromosomes.

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What is an autosome?

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Autosomes are chromosomes that are not directly involved in determining the sex of an individual; humans have 22 pairs of autosomes.

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What is a sex chromosome?

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Sex chromosomes are the chromosomes that determine the sex of an individual; humans have one pair of sex chromosomes (XX for female, XY for male).

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What happens during Prophase I of meiosis?

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During Prophase I, homologous chromosomes pair up and exchange segments (crossing over), and the nuclear envelope begins to break down.