Animal Farm Episode 1, Part 3 of 10. Chpt 3 One Wrong Letter. Meet the Super Cow. DNA. Genetics 1. Online Education Kit: Dynamic Timeline.
Genetic engineering. DNA replication. Simulations. Blood Typing. Drag-and-Drop Genetics: Monohybrid. Learn.Genetics™ Genetic Disorders. Genetics Animations. Animated Blood Types. Since Rh negative people may produce anti-Rh antibodies, Rh positive blood should not be given to an Rh negative recipient. 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. This could occur during the latter months of pregnancy or when the baby is delivered. Like most topics in biology, the true life explanation is a lot more complicated. DNA . Genetics. DNA . Genetics.
DNA . Genetics. In the 150 years since Mendel's first experiments, geneticists have discovered that genetic traits usually don't follow simple inheritance patterns. 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. Now that you know a little about blood types, let's learn about the genes that code for them. DNA . Genetics.
Mendelian & other patterns.