In early spring, the seeds germinate and begin the process of forming a new plant. In each season the user can do different things with the plants. The five seasons used in the model are shown in the SEASON-NAME monitor: early spring, late spring, summer, fall, and winter. When the user presses GO and then clicks on the NEXT SEASON button, the seeds begin to advance through different stages of plant growth. The last pair of genes is for leaf pattern. The next pair of genes is for the expression of flower color. One pair of genes is for the expression of plant height. These seeds carry three genes for each trait they express. On SETUP, a number of seeds (set by INITIAL-SEEDS) are randomly distributed about a garden. USE-GREENHOUSE? when on a section of the world will be designated as the greenhouse when SETUP is pressed. The label will be inherited by the next generations of seeds the plant produces.ĪDD-WILD-SEEDS? allows the user to add new random seeds during the fall or winter. LABEL-SEEDS-AND-PLANTS? allows the user to assign a label to any seed or plant they move. SHOW-FERTILIZATION-NETWORK shows lines between which plants have cross-fertilized. If a mutation is added, the result may be the genotype does not actually change, if the gene that was randomly replaced is replaced with the same gene as before or if the overall genotype has a different order for the genes, but not a different combination. INITIAL-SEEDS sets the number of initial seeds that appear randomly distributed in the world.ĬHANCE-MUTATION sets the chance that a mutation is introduced when plants are fertilized from the known set of available genes W, R, T, t, C, and c. POLLINATE WITH BEES - randomly pollinates any plants that are not yet pollinated You must press this button to move the plants through their different stages of growth and reproduction.ĬLEAR SELECTED - clears any plants or seeds from the currently selected field. SETUP - sets up the initial conditions set on the sliders. The genotype and phenotype each plant follows the following dominant-recessive gene expression patterns:Ĭc - variegated green and yellow leaf HOW TO USE IT Plants have two possible genes that determine their expression of leaf pattern: C or c. The genotype and phenotype each plant follows the following dominant-recessive gene expression patterns: Plants have two possible genes that determine their expression of plant height: T or t. The genotype and phenotype each plant follows the following co-dominant gene expression patterns: Plants have two possible genes that determine their expression of flower color: W or R. Greenhouse plants can not be fertilized, unless they are moved outside the greenhouse. But plants in the greenhouse are only permitted to cross-fertilize their pollen to plants outside the greenhouse. Keeping a plant in the greenhouse, ensures that it can be used in future seasons for additional cross fertilization experiments. The user can allow these seeds of the plants to grow in the same location or move, organize, and label the seeds to make better sense of the outcomes of various fertilization events, in the following season of plant growth.Īlso the user can move plants to the greenhouse location to "over winter" the plants so that they do not die at the end of the growing season. Plants drop the seeds they create in the same location the parent plant was growing. Once fertilized, the same plant can not be fertilized again in that same growing season. After fertilization, seeds immediately form. This population of plants can be fertilized in the wild using bees to transmit pollen from one plant to another, or the user can artificially cross fertilize some or all the plants by hand (using the mouse to transfer pollen from one plant to another). The other is between two co-dominant genes. One of these set of patterns is between a dominant and recessive forms (alleles) of a gene. This model lets you conduct experiments in Mendelian genetics with cross fertilization in a population of flowering plants.Ī population of plants is used to show two sets of patterns of gene expression. You can also Try running it in NetLogo Web If you download the NetLogo application, this model is included. (back to the library) Plant Hybridization NetLogo Models Library: Plant Hybridizationīeginners Interactive NetLogo Dictionary (BIND)
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