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DNA
S1 Science
Biological Sciences
Learning outcomes
Understand the role of the nucleus in
controlling the cell.
Success criteria
State what “DNA” is.
State where DNA is found in a cell.
State what a “gene” is.
State what a “chromosomes” are.
Describe three ways in which the
chromosomes of one organism might
differ from another.
DNA
• DNA contains the genetic instructions
which control the development and
function of all known organisms.
• DNA is found in the nucleus of a cell.
Gene
• A gene is a section of DNA which
controls an inherited characteristic
– e.g. eye colour, size of your feet, left or
right handed, skin colour
Chromosome
• A chromosome is a single piece of coiled
DNA containing many genes.
• Different organisms have different
numbers of chromosomes in their cells.
Different organisms
• Different organisms have different:
– numbers of chromosomes
– sizes of chromosomes
– alleles (forms) of gene on chromosomes
Learning outcomes
Understand the role of the nucleus in
controlling the cell.
Success criteria
State what “DNA” is.
State where DNA is found in a cell.
State what a “gene” is.
State what a “chromosomes” are.
Describe three ways in which the
chromosomes of one organism might
differ from another.