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11 Cards in this Set
- Front
- Back
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homologous chromosomes
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-two chromosomes of the same type
-homologs carry the same genes, but each homolog may carry a different allele -each chromosome is either maternal or paternal in origin |
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karyotype
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the number and types of chromosomes present
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diploid
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having two versions of each type of chromosome
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haploid
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having just one version of each type of chromosome
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n
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"haploid number"
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Steps in Meosis
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Interphase
Early Prophase I Late Prophase I Metaphase I Anaphase I Telophase I Cytokinesis Prophase II Metaphase II Anaphase II Telophase II Cytokinesis |
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Early Prophase I
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-chromosomes condense, spindle apparatus forms (like mitosis)
-synapsis of homologs occurs |
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Late Prophase II
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-Crossing over of non-sister chromatids
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nondisjunction
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error in meiosis in which homologous pairs don't migrate to opposite poles, not evenly separated
n+1 the cell that got the extra homolog n-1 the cell that lost a homolog |
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trisomy
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n+1 cross w/n = 2n+1
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monosomy
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n-1 cross w/n = 2n-1
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