Posts Tagged ‘meiosis’

Higher level genetics

Saturday, August 6th, 2011

This is Topic 10.  Syllabus guide here: IB-Biology-HL-Topic-10-syllabus-guide

Hopefully, much of this will be REVIEW.  I’m planning to spend 3 lessons – no more.

Firstly, meiosisHere’s what you need to know. BE CAREFUL with the vocab.

Next, dihybrid crosses and gene linkage.  This is the fun stuff! Presentation here.  PRACTICE makes maybe not perfect, but certainly BETTER 🙂

Lastly, polygenic inheritance.  What is it and how does it work? This will explain.

First assessment of the year will be MONDAY 15th AUGUST.

What phase of meiosis is shown in this picture?

Almost there!

Monday, June 6th, 2011

Claire's cakes by wuperruper on flickr

Just when you thought it was all over …. without you knowing it, we have been working through Topic 10, which is the higher level material on meiosis and genetics.  I am fairly happy that we will complete this before you disappear for a few well-earned weeks of rest.  Here is the syllabus guide for the topic, and a link to the presentation we used in class. IB Biology HL Topic 10 – syllabus guide

This presentation is an excellent review and extension of meiosis.  And this one is all about polygenic inheritance.


Wednesday, April 13th, 2011

genes on parade by Esthr on flickr

Here are some of the terms we will get to terms with in this section 🙂

diploid, haploid, homologous chromosomes, crossing over, non-disjunction, trisomy, karyotyping

  • We’ll learn about the process of meiosis, and why it is known as a reduction division.
  • We’ll understand how chromosome abnormalities such as Down’s syndrome come about.
  • We’ll learn what a karyotype is and how to analyse one.
  • And we’ll discuss some ethical issues to do with karyotyping of unborn fetuses. 

There are a number of ToK links here, such as balancing the risks of side-effects with preparing for a chromosome abnormality in an unborn child.  There are also questions raised about who should make the decision about whether to perform the karyotype – the parents, doctors, governments?

Here is Mr Taylor’s presentation on this topic.  And here is a very very very dated but well done video.   Biologix__Meiosis_and_Gamete_Formation

We’ll use this site – The Biology Project – to practise karyotyping.

Good review presentations

Friday, August 14th, 2009

Here are some great presentations from an IB Biology teacher in Indonesia.  I’m sure he’d appreciate a word of thanks if you find them useful.

Dihybrid crosses, gene linkage and recombination

Polygenic inheritance

Meiosis HL

Chi-squared test

Linkage and recombinants

Thursday, August 13th, 2009

Here is the document we worked through in class today, with some extra bits on meiosis too.  Thanks to Mr. Boulton for the resource. Topic 10 notes