Photosynthesis Cellular Respiration Genetics "Pea Soup" - Pea Experiment This is an interactive pea experiment where you can breed your own hybrid pea plants! You will start with two parent plants and end up with four child plants *. Pick two of those to breed together for four new children, and so on. (Note: you can breed a plant with itself.) There are two attributes passed between generations in this simulation. These are the out of the seven main attributes studied by Mendel: Pea color (green or yellow) Pea shape (round or wrinkled) Each of these attributes are 'simple traits,' that is, there is no 'grey' area of an attribute. The source code to this program is available.
Cell Division Mitosis: An Interactive Animation This animation demonstrates the stages of mitosis in an animal cell. Use the control buttons along the bottom to run the complete animation. Click on any intermediate stage (for example, Anaphase), and see a representative still frame. Interphase: Cells may appear inactive during this stage, but they are quite the opposite. This is the longest period of the complete cell cycle during which DNA replicates, the centrioles divide, and proteins are actively produced. For a complete description of the events during Interphase, read about the Cell Cycle. Prophase: During this first mitotic stage, the nucleolus fades and chromatin (replicated DNA and associated proteins) condenses into chromosomes. Prometaphase: In this stage the nuclear envelope breaks down so there is no longer a recognizable nucleus. Metaphase: Tension applied by the spindle fibers aligns all chromosomes in one plane at the center of the cell. Cancer cells reproduce relatively quickly in culture.
Biodiversity LogiCity - Introduction Earth Observatory : Home World of Change Satellite images showing how our world— forests, oceans, cities, even the Sun— has changed in recent decades. Read more Blue Marble Composite satellite images of the entire Earth. Earth at Night The night side of Earth twinkles with light in these composite global and regional views. Experiments Hands-on educational activities. Visible Earth A catalog of NASA images and animations of our home planet. NASA Earth Observations View, download, and analyze imagery of Earth science data. Earth Science Picture of the Day