A 3.1 Diversity of organisms

Syllabus statements

A3.1.1 Variation between organisms as a defining feature of life

A3.1.2 Species as groups of organisms with shared traits

A3.1.3 Binomial system for naming organisms

A3.1.4 Biological species concept

A3.1.5 Difficulties distinguishing between populations and species due to divergence of noninterbreeding populations during speciation

A3.1.6 Diversity in chromosome numbers of plant and animal species

A3.1.7 Karyotyping and karyograms

A3.1.8 Unity and diversity of genomes within species

A3.1.9 Diversity of eukaryotic genomes

A3.1.10 Comparison of genome sizes

A3.1.11 Current and future use of genome sequencing

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A3.1.12 AHL Difficulties applying the biological species concept to asexually reproducing species and to bacteria that have horizontal gene transfer

A3.1.13 AHL Chromosome number as a shared trait within a species

A3.1.14 AHL Engagement with local plant or animal species to develop a dichotomous key

A3.1.15 AHL Identification of species from environmental DNA in a habitat using barcodes