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Homologous pair of chromosomes
One from eah parent
The same genes in same positions (can be different alleles)
Same length and size.

Allele
Form of a gene
Locus
Where on the chromosomes the alleles are
Haploid
Half the number of chromosomes (23 in humans)
Diploid
Full set of chromosomes (23 pairs = 46

How can genetic variation be creatd
Crossing over - chromatids twist around each other and swap
Contain the same genes but different alleles.
Random fertiliation - any sperm can fertilise any egg
Each indiviual is unike any to have exstedbefore or any that will exit again