Tag Archives: variation

IGCSE Bio Topic 17 – Inheritance

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

Speciation: an illustrated introduction in 8 minutes or how about the Speciation Song – a song and an animation to introduce Speciation?

 IB 10.3 – Gene Pools and Speciation, a 14m 40s video lesson from Dan Rott videos.

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:

17.5 Monohybrid Inheritance (Genetics)

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

17.5 Inheritance notes in downloadable word format; to be completed.

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

BBC Short Circuit Genetics – a 19m video.

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

IGCSE Bio Topic 18 – Variation & Selection

Topic 18 revision notes in downloadable word format; to be completed.


It’s coming!


A lesson in Plant Adaptations from Ms Cooper (12m 15s); Specialized Leaves, a short 1m 39s video.


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).

A simulation of 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).

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


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

Igcse biology edexcel 5.10 5.20 from Marcos Rodriguez

A lesson on Selective Breeding from Mr Dare:

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 here is Mitosis versus Meiosis RAP BATTLE (from Asap SCIENCE). Finally, Hitler gets confused by Meiosis.

To diagnose genetic (chromosomal) diseases in an unborn baby, there are two ways of taking samples – Amniocentesis or Chorionic Villus Sampling.

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.