IB Biology Sub-topic A3.1 Definitions

This page contains our IB Biology definitions for sub-topic A3.1. By learning each one of these definitions, you will fully cover the content for IB Biology 'Diversity of organisms'.

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

allele

Various specific forms of a gene that only differ from each other by one or a few bases

autoradiography

A process by which a substance is radioactively labelled, coated with photographic film, and then viewed under a microscope

genome

All the genes in an organism

karyogram

An image showing an organism's homologous chromosome pairs in order of decreasing length to determine an individual's sex or or diagnose chromosomal abnormalities

karyotype

A person's number and type of chromosomes

species

A group of organisms that can potentially interbreed