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20 Cards in this Set
- Front
- Back
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Phases of sexual reproduction
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meiosis
gamete formation fertilization |
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meiosis
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nuclear division with daughter cells of haploid chromosomes in varied combination
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diploid number
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cell condition in which there are two of each chromosome ( a whole set )
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haploid number
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cell condition in which there are only one type of each chromosome ( no sets )
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gametes
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haploid reproductive cells of sexually reproductive organisms
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zygotes
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diploid cells formed by the fusion of two gametes
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homologous chromosomes
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paired chromosomes in diploid body cells that have genes for the same trait in the same order
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alleles
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alternate form of the same gene
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synapsis
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side by side pairing of homologous chromosomes during meiosis 1
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bivalent
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two homologous chromosomes that stay in close association during meiosis 1
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crossing-over
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exchange of genetic material between two non-sister chromatids of a bivalent during meiosis 1
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independent assortment
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the random orientation of homologous chromosomes toward either pole at the metaphase plate
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fertilization
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fusion of an egg an a sperm nuclei, producing a zygote that develops into a new individual
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meiosis I
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the first phase of meiosis in which the diploid parent cell divided into haploid daughter cells
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Prophase I key events
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synapsis and crossing over occur
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metaphase I key events
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bivalents align at the metaphase plate during which independent assortment occurs
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anaphase I key events
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homologus pairs separate and move to opposite poles
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telophase I key events
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spindles disappear and new daughter nuclei may appear
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interkinesis
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a fifthe phase of meiosis I, a waiting period between phases during which no DNA replication takes place
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spores
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a plant reproductive cell that develops into a new multicellular structure without needing to fuse with another reproductive cell
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