This interactive exercise allows the user to explore how the failure of chromosomes to separate during meiosis can result in Down syndrome, a congenital condition involving serious mental retardation. The user evaluates the influence of Down syndrome babies, creating in each case a graph showing the incidence as a function of age. The way in which primary nondisjunction in meiosis I produces Down children can be explored by comparing normal meiosis with on in which primary nondisjuction of chromosome 21 occurs.
This interactive exercise allow the user to explore how a mitochondrion does its job. It present a diagram of a mitochondrial membrane in cross section, in which the user can explore how electrons garnered from food molecules are use to drive proton pumps and how, by chemiosmosis, this produces ATP. The key variables manipulated by the user are oxygen levels, the amounts of food supplied, and existing levels of ATP (high levels shut down electron extraction from food, favoring storage instead).
Interactive exercises allow students to solve a genetics problem, then test their skills by analyzing data from the exercise and answering associated questions.
This interactive exercise allows students to explore the influence of physical separation upon genetic recombination by moving the relative position of genes on a chromosome. The exercise presents a diagram of the X-chromosome of Drosophila, on which are located the genes determining yellow body color (the normal body color is gray), white eye color (the normal eye color is red), and miniature wing size (the normal wing is 50% longer). Alongside the map is a collection of flies representing the progeny of a 3-point cross. By scoring the flies and placing them in the correct phenotypic class, students build an estimate of the recombination frequency between the genes. Student may then alter the position of the genes on the map, and see what effect this has on relative recombination frequencies.
|Exercises to print||Listening|
|Formulas||Proverbs and Idioms|
|Games to print||Songs|