Tag Archives: genetics

Hardy-Weinberg Principle

D4 The Hardy Weinberg Principle notes – these are taken from BioNinja (with thanks).

Paul Andersen (from Bozeman High) shows you how to Solve Hardy-Weinberg Problems.

Here are three sites with practice Hardy-Weinberg questions: here, here, and here.

In Crash Course Biology #18 – Population Genetics: When Darwin met Mendel, Hank talks about population genetics including the Hardy-Weinberg equation.

The Hardy-Weinberg Principle: Watch your Ps and Qs – a video lesson with some practice questions.

B9 Syllabus Statements & overview

All of B9 Revision notes in downloadable word format and here are key terms and some definitions: Key Terms B9

GCSE Bitesize more-or-less covers all of Variation, Inheritance & Evolution in 15m.

For self-assessment questions, with exercises and discussions, just click on the correct topic at Biology GCSE & IGCSE Question Bank. A powerpoint can be downloaded from the same site here. The s-cool revision site lets you revise the topic, summarizes the topic & tests you on it. GCSE Bitesize has revision pages (that take you through the topic), a test and an activity.

Here’s Penguins in peril: Inheritance – know your genetic jargon & ratios:

Play this game on the what2learn site

This is a great power-point that covers most of this topic, although we don’t need to know about co-dominance or pedigree charts:

10.1 Meiosis

10.1 meiosis from Bob Smullen

Here are some fantastic animated tutorials about Meiosis from McGraw Hill Education – how Meiosis works, the stages of Meiosis, Meiosis I, Meiosis II, Crossing-over, Independent Assortment & unique features of Meiosis.

From Sinauer Associates comes an animated, narrated tutorial on Independent Assortment which also includes a quiz; there’s also one on Independent Assortment & gamete diversity (with a quiz) and one on mistakes in meiosis – nondisjunction.

Mr. Andersen uses chromosome beads to simulate both Mitosis and Meiosis:





Independent Assortment & Segregation (click to enlarge)

3.1 Genes

IB Biology 3.1 genes from Bob Smullen

Many assessment statements are covered in videos by Stephanie Castle (with more being added all the time).

Some excellent interactive animations & tutorials on DNA & Genetics – just click on ‘Tour the Basics’ & ‘Heredity & Traits’.

Where do genes come from? A TED-Ed video (not on the syllabus):

10.3 Gene Pools & Speciation

10.3 gene pools and speciation from Bob Smullen

Find a video lesson on this sub-topic at Dan Rott videos.

The Speciation Song – a song and an animation to introduce Speciation.

Crash Course Biology #15 – Speciation: Of Ligers & Men, in which Hank explains speciation in terms of finches, ligers, mules and dogs.

Paul Andersen (from Bozeman High) explains Reproductive Isolation and Speciation, then details the processes of Speciation & Extinction and finally describes Genetic Drift (this is more detail than is required for IB).

Here’s a presentation that explains the origin of species (speciation) very clearly:

B9.2 Cell Division

Mitosis (in english). And here is Mitosis in american & mitosis – a 2m 45 s vid from Bitesize Top 20 Demos. Also here is What is Mitosis? (a 3m 45s lesson) & Mitosis music video by Peter Weatherall (2m 7s).

B9.2 Revision notes in download able format.

Here is Meiosis in american (and in more detail than you need).

Science Bank 9 (Cells & Tissues): Part 3 (from 9m 15s) also covers Mitosis & Meiosis. As does Cell Division (a 2m 3s vid from BBC iScience) & Cell Division (a 5m 23s vid from GCSE Bitesize).


IGCSE Biology: Coursebook, chapter 14, pp.195 – 197

B9.3 Monohybrid Inheritance (Genetics)

A short, simple explanation of Gregor Mendel’s work and simple gentetic crosses:

GCSE Bitesize – Inheritance, a tutorial (4m 46s):

B9.3 Revision notes in downloadable word document

BBC Short Circuit Genetics – a 19m video.


IGCSE Biology: Coursebook, chapter 14, p. 199 & pp.201 – 204

Here are some videos about genetic diseases: Sam’s story (cystic fibrosis) & CF short movie; sickle cell anaemia; what is Huntington’s disease?

B9.4 Variation & Selection

The Evolution of Life on Earth in 24 hours:

What is Evolution? A 9m video from Stated Clearly:

What is Natural Selection? A 9m video from Stated Clearly:

How evolution works – a gentle 12m cartoon video (from Kurz Gesagt – in a nutshell) and here is Natural Selection made easy in a 9m 48s video (from potholer54).

B9.4 Revision notes in downloadable word format.

A simulation of Natural Selection:

Natural Selection

Click to Run


Here’s Darwin’s Song from Horrible Histories and in What is Evolution? Biology teacher Ceri Evans gives a master class to students on what he says is arguably the greatest idea anybody ever had: evolution (28 mins). 2 more videos – James May’s things you need to know – Evolution (29m) & BBC Short Circuit Theory of Evolution (19m).

This powerpoint covers Artificial Selection (selective breeding) – but we only need the first five slides:

Finally, a short (less than 5 minute) video clip from BBC iScience – Evolution of the Eye.


IGCSE Biology: Coursebook, chapter 14, pp. 204 – 210 & 213 – 214

3.3 Meiosis

IB Biology 3.3 meiosis from Bob Smullen

Mr. Andersen uses chromosome beads to simulate both Mitosis & Meiosis (11m 53s):

A short, simple animation to show meiosis and two animated, narrated tutorials – one from McGraw Hill Education – Mitosis & Meiosis compared and one from Sinauer Associates – Meiosis that also includes a quiz.

In Crash Course Biology #13 – Meiosis: Where the Sex Starts, Hank gets down to the nitty gritty about meiosis.

Here is Mr W’s Meiosis! Rap and finally, Hitler gets confused by Meiosis.

9A Inheritance & Selection


Scientific Eye – Reproduction & Genetics (a 19m video) and here is a 15m 25s video covering Variation, Selective Breeding & Classification from KS3 Bitesize:

What is Selective Breeding? – a 2m 30s video:

Super Cow Creatorsthese gigantic cows resemble bovine body-builders. See how breeders have achieved such amazing results (4m 44s).

BBC Short Circuit Genetics – a 19m video – and Genetic Engineering (Science in Focus) – another 19m video.

3.4 Inheritance

IB Biology 3.4 inheritance from Bob Smullen

A short, simple explanation of Mendel’s work:

Mr Andersen talks you through Genetics:

And here Paul Andersen introduces A Beginner’s Guide to Punnett Squares in a 12m 15s tutorial. He also gives examples of monohybrid crosses and one example of a dihybrid cross (which we don’t need to know for SL).

An animated, narrated tutorial on Mendel’s experiments &  genetic crosses from Sinauer Associates.
In Crash Course Biology #9 – Heredity, Hank and his brother John discuss heredity via the gross example of relative ear wax moistness.

Inheritance of blood types:

3.5 Genetic Modification & Biotechnology

IB Biology 3.5 genetic modifcation and biotechnology from Bob Smullen

An animated, narrated tutorial on Gel Electrophoresis which also includes a quiz (from Sinauer Associates); and here is a video tutorial from Stephanie Castle:

For Gel Electrophoresis & DNA profiling – click on ‘Restriction Digestion & Gel Electrophoresis’ to see an Interactive Animation from Wiley or here for fantastic animated tutorials from McGraw Hill Education – DNA fingerprinting & Restriction fragment length polymorphisms (RFLPs) or how about a 5m27s lesson from Naked Science Scrapbook: how does DNA fingerprinting (DNA profiling) work?. Or, finally, Paul Andersen describes the process of DNA Fingerprinting and DNA profiling.

How to set up and run a Gel electrophoresis (for DNA profiling):

For Gene Transfers (genetic modification) see these fantastic animated tutorials from McGraw Hill Education – Restriction Endonucleases, steps in Cloning a gene & construction of a Plasmid vector or click on ‘Cloning’ to see an Interactive Animation from Wiley.

An animated, narrated tutorial on human embryonic stem cells (from Sinauer Associates).

Some excellent interactive animations & tutorials on Stem Cells, Gene Therapy or Cloning just click on Genetic Technology at the bottom of this page or for DNA extraction, Gel electrophoresis, PCR & DNA microarrays just click on Virtual Labs.