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Genetic Disorders. DNA . Genetics. DNA . Genetic Engineering. DNA . Genetics. In the 150 years since Mendel's first experiments, geneticists have discovered that genetic traits usually don't follow simple inheritance patterns.

DNA . Genetics

Some traits, like human eye color and stature, are produced by the interplay of many sets of genes; these are known as "polygenic traits. " Other traits show a phenomenon called intermediate expression, in which a heterozygous genotype will produce a phenotype that's different from homozygous dominant genotypes. In snapdragons, for example, a homozygous dominant genotype makes red flowers, homozygous recessive makes white flowers, and heterozygous individuals are pink. In addition, some genes have more than two different versions. This type of inheritance is called multiple allelic inheritance.

Now that you know a little about blood types, let's learn about the genes that code for them. DNA . Genetics. DNA . Genetics. Sickle Cell DNA. Stretching DNA - Optical Tweezers, Quantum Mechanics, Laser. Drag-and-Drop Genetics: Monohybrid. Learn.Genetics™ Simulations. Peppered Moth Simulation. Name:______________________________________________ Objective: Simulate changes in moth population due to pollution and predation, and observe how species can change over time.

Peppered Moth Simulation

Introduction: Charles Darwin accumulated a tremendous collection of facts to support the theory of evolution by natural selection. One of his difficulties in demonstrating the theory, however, was the lack of an example of evolution over a short period of time, which could be observed as it was taking place in nature. Although Darwin was unaware of it, remarkable examples of evolution, which might have helped to persuade people of his theory, were in the countryside of his native England.

The economic changes known as the industrial revolution began in the middle of the eighteenth century. Instructions: Click the link below to read more information on Kettlewell's study of moths. After 5 minutes record the % of dark moths and light moths - you will need this information later. Data and Analysis. Interactive Activity.

Drag-and-Drop Pedigree 1: Tongue Rolling. DNA zoom - interactive. Learn.Genetics™ Your Genes, Your Health. What Color Eyes will your Children Have? Animations. Genetics Animations. Blood Typing. Animated Blood Types. Since Rh negative people may produce anti-Rh antibodies, Rh positive blood should not be given to an Rh negative recipient.

Animated Blood Types

Based upon the above table, Rh positive recipients can theoretically receive positive or negative blood, and Rh negative donors can theoretically give to Rh positive and Rh negative recipients. Therefore, the "universal donor" is O Negative, while the "universal recipient" is AB Positive. Anti-Rh (immune-type) antibodies can readily pass through the placental capillary membranes.

A serious potential problem called maternal-fetal blood incompatibility or Rh Disease could occur with a pregnant Rh negative mother who carries an Rh positive fetus. Leakage of fetal red blood cells (RBCs) into the mother's system through minute lesions in the placenta may cause her to produce anti-Rh antibodies. There are also reported cases of maternal-fetal blood incompatibility with the A-B-O blood groups; however, the Rh factor appears to be much more common.