A3.1 diversity

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content on diversity from 3.1

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10 Terms

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where does variation come from

  • sexual reproduction (mixing of two organisms’ dna, production of gametes)

  • mutations in dna

  • errors in dna replication

  • viral injection of foreign dna

  • environmental and epigenetics effects on gene expression

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variation

difference in traits between individuals of the same species

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morphological species concept

species as groups of organisms with shared morphological (physical) traits

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variation as a defining feature of life

no two individuals are identical in all their traits

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naming system of organisms

binomial nomenclature

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parts to binomial nomenclature

  • genus first with capital letter

  • species second, lowercase

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biological species concept

a species is a group of organisms that can breed and produce fertile offspring

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geographical isolation for speciation

physical habitats such as rivers, oceans, mountains disjunct habitats

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behavioural isolation for speciation

two populations are capable of interbreeding but have different behaviours such as courtship rituals

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temporal isolation for speciation

two population reproduce/mate at different times