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DNA structure
- DNA molecule= deoxyribonucleic acid, made up of two strands of nucleotide, double helix shape
- Four nitrogenous bases: adenine (A), thymine (T), cytosine (C), guanine (G)
- Between two strands of nucleotides, adenine always paired with thymine (AT), and cytosine
always paired with guanine (CG). Bases…

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Meiosis (aka. Reduction division)
- During sexual reproduction 2 haploid gametes fuse
to make 1 diploid zygote. Gametes haploid or zygote
would have double the number of chromosomes
- Same as mitosis up to (and including) stage 3
4.The pairs of chromosomes are separated
and pulled to opposite ends of…

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- Huntington's disorder- caused by dominant allele (written as H). Symptoms develop in middle age
and include: short-term memory lapses, mood changes, lack of concentration and slight,
uncontrollable muscle movements

Pedigree chart example
Square = boy, circle = girl, blue = sufferer, white = no symptoms (could be carrier too…


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