Explore inheritance when carried on the X chromosome with the Amoeba Sisters! This video focuses on how to do general Punnett square problems that involve traits on the sex chromosomes (X and Y chromosomes). We do want to point out...

Paul Andersen reviews the concepts discovered by Gregor Mendel.

Hank gets down to the nitty gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic organisms.

Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin, and by means of the Hardy-Weinberg equation.

Explore autosomal recessive trait and X-linked recessive trait tracking in pedigrees with the Amoeba Sisters! Table of Contents: Intro 00:00 Introducing Symbols/Numbering in Pedigree 0:40 Meaning of Shading in Shapes 1:19 Introducing...

In this video Paul Andersen explains the elements in the Hardy-Weinberg equation; including the allele frequency and phenotype frequency. He begins with a brief explanation of phenotypes and genotypes. A sample problem is worked out...

Paul Andersen explains important concepts that can not be explained by simple Mendelian genetics. He begins with a discussion of polygenic inheritance and uses a simulation on height to show how a bell shape curve of phenotypes is...

Hank brings us the story of Gregor Mendel, the Austrian monk who, with the help of a garden full of pea plants, discovered the fundamental properties of inheritance and paved the way for modern genetics. He also gives us the dirt on a...

Genetics are extremely complicated—so complicated that having an extra finger or toe, for example, is exceedingly rare despite it being caused by a dominant gene.

Hank and his brother John discuss heredity via the gross example of relative ear wax moistness.

New ReviewThis captivating program uses colorful animations to illustrate the process by which genetic information is transferred by genes. Special attention is placed on how different alleles enable different traits to be expressed. The Law of...

Blood grouping is based on the presence of specific antigens—A, B, and H—on red blood cells, encoded by the ABO gene system. Individuals with blood type A have A antigens and anti-B antibodies, B has B antigens and anti-A antibodies, AB...

Humans inherit two alleles for each gene, and their interaction determines how traits are expressed—homozygous if both alleles are the same, and heterozygous if they differ. In complete dominance, one allele masks the other; in...

Multiple allele traits are controlled by a single gene with more than two allele variants, as seen in the ABO blood group system, which involves the alleles IA, IB, and i. The six possible genotypes result in four blood types, with IA...

A dihybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in two traits. The individuals in this type of cross are homozygous for a specific trait. Traits are characteristics that are...

Our physical appearance is significantly influenced by our genes, which are inherited from our parents, who in turn receive their genetic material from their own parents. When your genetic makeup closely mirrors that of your...

A recessive allele is the version of a gene that will only be expressed if two copies are present, one from each set of chromosomes.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds...

The unit of inheritance in organisms, generally consisting of a piece of DNA that encodes the production of a specific protein.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using...

Alternative forms of a gene, which affect the expression of a particular trait, such as eye colour or blood type.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning...

Discover how Huntington's disease is passed on through a single gene. How does it progress, what are the symptoms and is there a treatment? Biology - Cells And DNA - Learning Points. Huntington's disease is a genetic disorder that is...

What is cystic fibrosis? Find out what the symptoms are and how it is caused. Biology - Cells And DNA - Learning Points. Cystic fibrosis is a serious progressive, genetic disease that affects the whole body. Cystic fibrosis is caused by...

If you inherit two copies of every gene, one from each parent, how do your cells know which version to use? Biology - Cells And DNA - Learning Points. Alleles, alternative forms of genes, can be dominant or recessive. Dominant alleles...

Dive into the intricate world of genetic inheritance to understand how dominant and recessive alleles shape our traits, from tongue rolling abilities to eye color. Learn why siblings can inherit different traits from the same parents...

Our physical appearance is significantly influenced by our genes, which are inherited from our parents, who in turn receive their genetic material from their own parents. When your genetic makeup closely mirrors that of your...