Gene DNA is a large molecule broken down into hereditary units called genes DNA is organized amp packaged into chromosomes Chromosome DNA wound or coiled tightly around proteins histones ID: 1000598
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1. Chromosome Structure ReviewGene – DNA is a large molecule broken down into hereditary units called genesDNA is organized & packaged into chromosomesChromosome – DNA wound or coiled tightly around proteins (histones)
2. Structure – fully condensed, duplicated A chromosome is made of 2 identical halves called a chromatids.A centromere holds 2 chromatids togetherDNA is packaged as a chromosome only during cell division, after it has been copied.When a cell is not dividing, its DNA is packaged more loosely as chromatin.
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4. Chromosome #’s Review- each species has a different number of chromosomesSex Chromosomes – and X or Y chromosomeAutosomes – all remaining chromosomesHomologous Chromosomes – a pair of similar chromosomes (1 from mom, 1 from dad)
5. Diploid Cells Are cells having all homologous pairs and 2 sex chromosomesbody cell, or somatic cells Diploid cell are abbreviated as 2n, where n = # of 1 set of chromosomes.The chromosomes of diploid cells can be arranged and studied using karyotypes.
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7. Haploid CellsCells that contain only 1 chromosome from the pair of homologous chromosomes and 1 sex chromosome.Haploid cells are abbreviated as n.Haploid cells are gametes.
8. Mitosis in a Plant Cell
9. Mitosis in an Animal Cell
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