Answer: DNA is copied during interphase (S phase) before mitosis and just before meiosis. Explanation:In human, mitosis produces diploid daughter cells which have the same number of chromosomes as the parent cell. Meiosis produces gametes (sperm or egg) which are haploid, meaning these cells have half the number of chromosomes as body cells such as skin cells. DNA is copied using a process called semiconservative replication. The video below shows how DNA is copied and then discusses the processes by which RNA and proteins are made. I have my students use computer models including "Building DNA" by Gizmos and an animated review of DNA replication. Students are asked to evaluate strengths and weaknesses of the models. Lessons on this topic can connect with NGSS crosscutting concepts such as "Systems and Sytem Models" by using computer models and "Structure and Function" by focusing on how the shape and structure of DNA allows the molecule to store genetic information. Hope this helps!
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Noel PaullerThank for visiting my blog where I post thoughts from the random corner of the universe which is my brain. Archives
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