Terms and Definitions (Grade 12 NSC Matric Life Sciences): Flashcards

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Terms and Definitions
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Building blocks (monomers) of nucleic acid

Nucleotide

Complementary base pairing rule in DNA

A pairs with T; C pairs with G

Mitosis products vs Meiosis products

Mitosis: 2 identical diploid; Meiosis: 4 different haploid

Genotype definition

Genetic make-up (composition) of an organism

Heterozygous

Two different alleles for a characteristic (e.g. Tt)

Motor (efferent) neuron function

Transmits impulses from brain/spinal cord to effectors

Medulla oblongata function

Controls involuntary actions (heartbeat, breathing)

Accommodation

Adjustment of lens shape to see objects near or far clearly

Natural selection

Environment/nature is the selective force

Dependent variable

Factor influenced by independent variable (result/effect)

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