DNA, GENES, & CHROMOSOMES: https://www.youtube.com/watch?v=_- 4TKFInXwE 1. Where do cells store DNA? Write the name of the organelle and point to it in the pictures 2. In simple terms, what is DNA/what is it used for? 3. What concept is represented by this picture? 4. What is the difference between DNA and chromosomes? 5. Explain the analogy of DNA/chromosomes and yarn/yarn balls 6. Which of the following is true? a) all life shares a common chromosome number b) different species have different chromosome numbers 7. This image represents the normal number of human chromosomes. Circle the 3rd pair and the 7th pair. 8. DNA is passed on in the form of chromosomes. For each pair, where do the chromosomes come from? 9. What is meiosis? *not in video* 10. Gametes contain only HALF of the total DNA. The total DNA in humans is 23 pairs of chromosomes (46 total). How many chromosomes do gametes (sperm and egg) have? a) 46 single chromosomes c) 23 single chromosomes b) 46 pairs of chromosomes d) 23 pairs of chromosomes 11. During fertilization, sperm and egg unite. Explain what happens to the genetic material during fertilization. 12. When sperm and egg unite, the first cell of the new offspring is formed. What is another name for this first cell? video* *not in 13. What is the definition of a gene? 14. Which of the following is true? a) Specific genes are located at specific places on specific chromosomes b) Genes can be located on any chromosome and gene location is different for every person 15. Where, specifically, is the gene that codes for insulin located? 16. Which of the following is true? a) You have a single copy of the insulin gene that you inherited from either the sperm or the egg b) You have 2 copies of the insulin gene- one passed on from the sperm and one from the egg. 17. Which of the following is true? a) You have a single copy of each human gene that you inherit from either the sperm or the egg b) You have two copies of every human gene- one from the sperm and one from the egg 18. All cells in YOUR body carry an identical copy of YOUR genetic code. If your cells (brain, muscle, skin, etc.) all have the same exact DNA, then how can they look and act so differently?! Explain. 19. In this image, what do the different lines on the chromosomes represent? CHECK LIST: Did you understand all of this?! DNA is a coded molecule that is passed on from parents to offspring in the form of chromosomes. Chromosomes come in pairs- you inherit one copy from the egg and one copy from the sperm. Each chromosome contains many genes, which are specific segments of the DNA. Each gene has the instructions to code for something specific in the body- like enzymes, hormones, pigments, etc Inherited chromosomes and genes determine the traits that make each of us unique.