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9 Cards in this Set
- Front
- Back
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Tetrade
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A paired set of homologous chromosomes, each composed of two sister chromatids. Tetrads form during prophase I of meiosis.
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sister chromatid
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One of the two identical parts of a duplicated chromosome in a eukaryotic cell.
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microtubule
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The thickest of the three main kinds of fibers making up the cytoskeleton of a eukaryotic cell; a straight, hollow tube made of globular proteins called tubulins. Microtubules form the basis of the structure and movement of cilia and flagella.
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centromere
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The region of a chromosome where two sister chromatids are joined and where spindle microtubules attach during mitosis and meiosis. The centromere divides at the onset of anaphase during mitosis and anaphase II of meiosis.
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zygote
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The fertilized egg, which is diploid, that results from the union of a sperm cell nucleus and an egg cell nucleus.
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Chiasma
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The microscopically visible site where crossing over has occurred between chromatids of homologous chromosomes during prophase I of meiosis.
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gamete
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A sex cell; a haploid egg or sperm. The union of two gametes of opposite sex (fertilization) produces a zygote.
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polyploid
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Containing more than two complete sets of chromosomes in each somatic cell.
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autosome
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A chromosome not directly involved in determining the sex of an organism; in mammals, for example, any chromosome other than X or Y.
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