Saturday, November 13, 2010
I think most people really underestimate how important it is to have healthy DNA, that is to keep your DNA seqence from being broken or changed. But right now I am just trying to get the concept of DNA structure across to my students. So far we have learned that DNA is made from nucleotide monomers (a sugar, phosphate, and a base). These nucleotide monomers come together to make the DNA double helix. Here are some pictures of students as we discussed DNA. We also make a 3-D foldable of DNA and I will try to get that picture up soon.
Thursday, November 11, 2010
My students are in the process of learning more about DNA and Heredity. We started our unit off with a lab activity that simulates gametogenesis in pea plants. In one class period we modeled what it took Gregor Mendel 40 years to complete. Unfortunatly we were so involved with collecting our data that I forgot to take pictures. However, today we are going to simulate how sexual reproduction can lead to genetic variation within one family. Students are modeling meiosis (using 14 chromosomes), and fertilization of a zygote. We will have plenty of pictures to share from this activity.