Paul Andersen explains aspects of genetics that were not covered by Gregor Mendel. He begins with the following topics; incomplete dominance, codominance, epistasis, multiple alleles, and multiple genes. He then explains how linked genes were discovered by Thomas Hunt Morgan and Alfred Sturtevant. He also discusses sex-linked traits. [14:22]

The following video narrated by Paul Andersen explains how the energy, charge, and momentum in a system is conserved over time. [4:53]

In the following video, Paul Andersen explains how energy can neither be created nor destroyed but may be transferred. Energy comes in many forms. [4:09]

Paul Andersen explains how energy is conserved within a system. In both macroscopic and microscopic collisions, the amount of energy before the collision is equal to the amount after. He then defines heat as energy transfer between objects with different temperatures. He explains how heat is transferred via conduction, convection, and radiation. [11:12]

In the following video Paul Andersen explains how linear momentum is conserved in all collisions. In completely elastic collisions the kinetic energy of the objects is also maintained. Several examples and demonstrations are included. [7:18]

In the following video Paul Andersen explains how the nucleon number and charge is conserved in all nuclear reactions and radioactive decay. Fission, fusion, alpha decay, beta decay, and gamma decay all conserve the number of neutrons and protons, as well as charge. [8:27]

In the following video Paul Andersen explains how contact forces result from interatomic forces. [5:29]

Paul Andersen explains how DNA replication ensures that each cell formed during the cell cycle has an exact copy of the DNA. He describes the Meselson-Stahl experiment and how it showed that DNA copies itself through a semi-conservative process. He then explains how multiple enzymes, like DNA polymerase, helicase, primase, ligase, and single strand binding proteins copy DNA. [10:09]

Paul Andersen starts with a brief description of feeding methods. He then details all of the major parts within the human digestive system. This tour starts in the mouth, move down the esophagus, through the stomach, small intestine, colon, and rectum. He explains how all of the major macromolecules are digested and absorbed by the body. A review worksheet is provided as well. [9:38]

Paul Andersen explains how biodiversity can be measured through genetic, species, or ecosystem variety on the planet. Species diversity is increased through speciation and decrease through extinction. The mechanism for speciation is evolution through natural selection. The planet provides ecosystem services at no cost to humanity. [7:08]

In this video, Paul Andersen explains how ecosystems respond to disruptions. Disruptions can cause changes in the number and variety of organisms. It can also lead to migration, extinction or even speciation. Ecosystems that have higher biodiversity are able to respond to large disruptions over time. [6:52]

Paul Andersen explains how ecosystems function. He begins with a description of how life on the planet is ordered from large to small in biomes, ecosystems, communities, population, and individuals. He describes the major terrestrial and aquatic biomes on the planet. [11:14]

The following video narrated by Paul Andersen explains how electric circuits contain different elements which can be connected in series or in parallel. The following four elements are explained in detail; emf, resistor, capacitor, and switch. The voltage and current of resistors in both series and parallel are explained. [9:36]

The following video narrated by Paul Anderson explains how electromagnetic induction occurs when the magnetic flux of an object changes. The magnetic flux is product of the surface area perpendicular to the magnetic field and the magnetic field strength. Microphones and generators are examples of devices that utilize electromagnetic induction. [7:54]

In the following video Paul Andersen details the waves in electromagnetic radiation. There is an inverse relation between the wavelength and frequency of electromagnetic waves. Electromagnetic radiation includes gamma rays, x-rays, infrared lights, visible light, uv light, microwaves and radio waves. [3:02]

In the following video Paul Andersen details the characteristics of electromagnetic waves. Electromagnetic waves are transverse waves that can move through both mediums and vacuums. The electric and magnetic fields oscillate perpendicular to the wave direction. [4:03]

This video narrated by Paul Andersen explains how the charge distribution can be affected my electric forces produced by a charged object. In an insulator charges are fixed but in conductors the charges can move. Induction occurs when the charges in an object influence charges in another object. [8:37]

Paul Andersen explains how electric charge is quantized and how the smallest unit of charge is 1.6x10^-19 C, or the elementary charge. [4:51]

In this video Paul Andersen explains that elementary reactions are steps within a larger reaction mechanism. Colliding molecules require sufficient energy and proper orientation to break bonds and form new bonds. A unimolecular reaction mechanism requires one type of reactant and is a first-order reaction. Enhance learning with the additional resources. [6:13]

In the following video Paul Andersen explains how the photons emitted from or absorbed by an atom or nuclei is directly related to electrons moving between energy level. Absorption and emission are a direct result of the conservation of energy. [5:18]