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DNA and Cell Reproduction |
Program Overview
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Modules: Mitosis: Chromosome Condensation, Mitosis: Stages, Cytokinesis, Meiosis, Nucleotide Structure and Bonding, Replication Enzymes, Replicating the Strands, The Twisting Problem, Proof Reading and Repair
Running time - 13 minutes
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DNA and Cell Reproduction DNA and Cell Reproduction is organized into short-play learning modules, for concise instruction.
- Mitosis: Chromosome Condensation (1:04) Shows the remarkable packaging of DNA as it condenses into chromosomes.
- Mitosis: Stages (2:24) Reviews the chromosome patterns seen at different stages of the mitotic cycle.
- Cytokinesis (00:30) Shows the basic differences between protist, animal and plant cell division.
- Meiosis (1:00) Shows how chromosome sorting and crossing over introduces new gene combinations into a population, while achieving the reduction of chromosomes to the haploid number.
- Nucleotide Structure and Bonding (1:26) Illustrates DNA chemistry, the basis for encoding genetic information in molecular structure.
- Replication Enzymes (1:02) Demonstrates the chemical steps in DNA replication and shows how each step is accomplished by means of an enzyme.
- Replicating the Leading and Lagging Strands (1:57) Because the two strands of DNA must be replicated in opposite directions, two different replication strategies are used at each replication fork.
- Topoisomerase and the Twisting Problem (00:43) To prevent tightening of the helix as it is opened, an enzyme nicks the strand and allows it to rotate, relieving tension and permitting the replication fork to advance.
- Proofreading and Repair (00:53) Damage to DNA is common, but a fleet of repair enzymes races over the DNA and corrects errors.
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