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...

Dominant trait needs only 1 affected allele, whereas recessive trait needs both allele. Normally a dominant trait will be seen in all generations, but a recessive trait may skip generations. We can have X-linked dominant or autosomal...

Summarized tips for Pedigree analysis

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...

Aztec Emperors Family Tree

New England is a beautiful region of the United States. But while the entire region is made up of 6 full states, Massachusetts is very dominant in terms of population and economy. In fact, Massachusetts by itself has more than twice the...

Japan is a fascinating country for a lot of reasons. But chief among them is the fact that well over half the population live in just three metropolitan areas: Tokyo, Osaka and Nagoya. And for a country that is both larger in population...

You’re going to gobble up these 25 Thanksgiving Day Signs! Join me as I teach you and Kate these 25 holiday signs in ASL. Be sure to stick around to the end and I’ll teach you a few sentences as well in American Sign Language. Happy...

The version of a particular gene that takes precedence over other variants, being expressed even if only one copy is present.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using...

How a 19th century Austrian monk explained the rules of genetic inheritance before anyone even knew genes existed. Biology - Cells And DNA - Learning Points. Before the discovery of genes, Austrian monk Gregor Mendel described three laws...

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...

A unique Siberian breeding experiment tried to rid wild foxes of their aggressive genes. Was the experiment successful? Biology - Cells And DNA - Learning Points. In 1959, Siberian scientists set up two breeding programmes using silver...

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...

I teach you over 70 Out to Eat or Food signs in ASL. It was too much for one video, so I made 2! This is part 1 with over half of those 70 signs. Even that was too much to...

It's part 2 of our Out to Eat series where I teach you over 70 food signs in American Sign Language (ASL). In this video we're covering drinks, desserts, meals and types of...

This is the first video in a longer series about Public Service signs. There are so many professions where workers interact with the public every single day. What do...

Learn how to sign 16 English American slang words in American Sign Language (ASL). Not only do I teach you the ASL Signs for all of these slang words, but I do my best to explain what they mean in English as well....

This video is Part 2 in our Public Services series. In this video I teach first responders, specifically Police, Fire and Paramedics, essential signs and...

Santa! In this video I teach you and Santa signs that you might see sitting on Santa's lap. Learn with Santa as he learns how to communicate with the Deaf Community this Christmas. There are...

This video covers: - The experiment that Mendel did with pea plants, looking at pea colour, flower colour, and height. - How Mendel discovered hereditary units, which could be recessive or dominant - An overview of when chromosomes, and...

To show how inheritance works we can use genetic diagrams and punnet squares. This video explores two examples to demonstrate everything you need know about them!

This video covers: - What family trees are and how they work - How to use keys - The example of cystic fibrosis - How to use family trees to predict the chance of a disease being inherited Exam board specific info: AQA - Everything is...