Tag Archives: variation

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:

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:

B9.3 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.