Variation and selection

Chromosomes, genes and DNA

What is DNA and how does it work

orang-utan DNA code

Chromosomes within a nucleus

How DNA codes for protein

Cell Division

Cell division


How a cell divides by mitosis

More on mitosis

Human Characteristics

DNA replication 


Difference between meiosis and mitosis

Genes and inheritance



Dominant and recessive genes

Eye colour

Alleles and eye colour 

Monohybrid cross

Tongue Rolling 

What makes you male or female

Sex determination

Cystic Fibrosis 


Natural Selection

What is natural selection

Tree of life 

What is evolution 

How  Evolution works

Antibiotic resistance 

Ape and man

Selective breeding

Super cow


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