KS4 Biology
Chromosomes,
Genes and DNA
1 of 47 © Boardworks Ltd 2004
, Contents
Chromosomes, Genes and DNA
Chromosomes and gender
DNA – the molecule of life
How DNA copies itself
DNA and the genetic code
2 of 47 © Boardworks Ltd 2004
, What are little girls and boys made of?
Sugar and spice and everything nice;
that’s what little girls are made of.
Slugs and snails and puppy dogs’ tails;
that’s what little boys are made of.
What are little girls and boys really made of?
3 of 47 © Boardworks Ltd 2004
, Inherited characteristics
What makes this baby human? What determines its gender?
In all living things, characteristics are passed on in the
chromosomes that offspring inherit from their parents.
So all human characteristics, including gender, must be
something to do with chromosomes.
Where are chromosomes found?
4 of 47 © Boardworks Ltd 2004
Chromosomes,
Genes and DNA
1 of 47 © Boardworks Ltd 2004
, Contents
Chromosomes, Genes and DNA
Chromosomes and gender
DNA – the molecule of life
How DNA copies itself
DNA and the genetic code
2 of 47 © Boardworks Ltd 2004
, What are little girls and boys made of?
Sugar and spice and everything nice;
that’s what little girls are made of.
Slugs and snails and puppy dogs’ tails;
that’s what little boys are made of.
What are little girls and boys really made of?
3 of 47 © Boardworks Ltd 2004
, Inherited characteristics
What makes this baby human? What determines its gender?
In all living things, characteristics are passed on in the
chromosomes that offspring inherit from their parents.
So all human characteristics, including gender, must be
something to do with chromosomes.
Where are chromosomes found?
4 of 47 © Boardworks Ltd 2004
