1. S1 Science Biological Sciences
DNA
S1 Science
Biological Sciences

2. Learning outcomes Success criteria
Understand the role of the nucleus in controlling the cell.
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.

3. 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.

4. 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

5. Chromosome
A chromosome is a single piece of coiled DNA containing many genes.
Different organisms have different numbers of chromosomes in their cells.

8. Different organisms Different organisms have different:
numbers of chromosomes
sizes of chromosomes
alleles (forms) of gene on chromosomes

9. Learning outcomes Success criteria
Understand the role of the nucleus in controlling the cell.
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.