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.

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:

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)

10.2 Inheritance

10.2 inheritance from Bob Smullen

Crossing over & Linked Genes: (a 7 minute lesson):

Paul Andersen explains how Linked Genes behave using fruit flies in a 17m 22s tutorial.


The science of skin color – Angela Koine Flynn, a 5m vid from TED-Ed.

Breaking the illusion of skin color, a 15m TED-Ed video from Nina Jablonski

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:

17.3 Mitosis & 17.4 Meiosis

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).

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).

17.3 & 17.4 revision notes in downloadable word format.