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Unformatted text preview: omosomes, so they are n (haploid) Somatic human cells have 2 copies of each chromosome called homologous pairs
One of the pair is inherited from the father, The other of the pair is inherited from the mother Homologous pairs are similar, but not identical
They carry the same genes in the same order They may carry different alleles (versions of a gene) Human cells have 23 pairs of chromosomes (46 chromosomes total) Organism Diploid Chromosome # Dog Cat Horse Potato 78 38 64 48 G2 phase of Interphase Spindle fibers ( made of microtubules) begin to assemble Centrioles divide (animals only) Now cell is ready for Mitosis Karyokinesis- division of the nucleus 4 phases Prophase Chromatin condenses into visible chromosomes Centrosomes migrate to poles
the microtubule-organizing center. Nuclear membrane disappears Spindle fibers attach to kinetochore Include prometaphase (for lab) Metaphase Chromosomes line up single file in the middle The spindle fibers push the sister chromatids until they are all arranged at the metaphase plate, an imaginary plane equidistant between the poles, defining metaphase. Anaphase centromeres divide, separating the sister chromatids. Ea...
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