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This Concept Map, created with IHMC CmapTools, has information related to: DNA Lesson Plan - Ellen Westerman, Explain the genetic mechanisms and molecular basis of inheritance. Using given data, students will be able to identify the base pairs that occur in a DNA molecule., Teacher talk: However, Watson and Crick were unsure of how these nitrogenous bases were arranged. They looked to earlier findings by Chargaff for inspiration to solve this puzzle., Teacher facilitation: After attempting to draw the DNA molecule, what information do you still need to draw an accurate model? How does knowing that sugar and phosphate alternate to make up the backbone of the helix affect your illustration? How does knowing that the nitrogenous bases are attached to the sugar affect your illustration?, Student performance: Using your knowledge about the structure of DNA’s backbone and the base pairing rules you came up with earlier in the lesson, draw a molecule of DNA labeling each of the following components - sugar, phosphate, base., Teacher talk: DNA was confirmed as the cell’s genetic material before the exact structure of this molecule was known. Using x-ray photography, Rosalind Franklin was able to photograph DNA. Later, Watson and Crick used her picture to determine that DNA occurs in a double helix. Sugar and phosphate compose the backbone of the DNA molecule and a combination of four nitrogenous bases composes the inside of the helix. ????, DNA Illustration, Base Pairing Rules, Use historical examples to explain how new ideas are limited by the context in which they are conceived. These ideas are often rejectedby the scientific establishment; sometimes spring from unexpected findings; and usually grow slowly through contributions from many different investigators. Using given data, students will be able to identify the base pairs that occur in a DNA molecule., Student performance: Using the Base Pairing Puzzle Pieces provided, determine how nitrogenous bases pair in DNA., Student performance: Refine your illustration incorporating the new information., Teacher facilitation: How did you determine how the bases paired? Was Chargaff’s discovery an important piece of information in determining the base pairing rules?, Using given data, students will be able to identify the base pairs that occur in a DNA molecule. Base Pairing Rules, Students will be able to describe the structure of DNA. DNA Illustration, Explain the genetic mechanisms and molecular basis of inheritance. Students will be able to describe the structure of DNA.