IB Biology D3.2 Notes

This page contains our IB Biology notes for D3.2. By reading each one of these notes, you will fully cover the content for IB Biology 'Polygenic inheritance'.

All Topic 3 Sub-topics

A3.1: Diversity Of Organisms

(HL)A3.1: Further diversity

(HL)A3.2: Classification & cladistics

B3.1: Gas Exchanges

(HL)B3.1: Further gas exchange

B3.2: Transport

(HL)B3.2: Further transport

(HL)B3.3: Muscle & motility

C3.1: Body Systems

(HL)C3.1: Plant systems

C3.2: Defence Against Infectious Disease

D3.1: Reproduction

(HL)D3.1: Further reproduction

D3.2: Monogenic Inheritance

(HL)D3.2: Polygenic inheritance

D3.3: Homeostasis

(HL)D3.3: Further homeostasis

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Segregation

In the HL syllabus, you are expected to understand the inheritance of two genes, called digenic inheritance. In digenic inheritance, the types of genes involved in inheritance affect the end result. There are two main types:

Unlinked genes are found on different chrosomes. As a result, they separate independently of one another, called independent assortment. As a result, four unique gametes are formed.
Linked genes are found on the same chromosome. As a result, they separate together, called dependent assortment. As a result, two unique gametes are formed.

Note that if linked genes are far apart, they may be exchange during crossing over. This results in four unique gametes, making them appear unlinked.

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