Topic 2 Genes, Chromosomes, DNA Flashcards
What is another name given to features that someone has
Characteristics
Some characteristics are inherited. Give some examples of inherited characteristics
hair colour
eye colour
freckles
tongue rolling
Some characteristics are due to your surroundings - environmental. give some examples
tattoo
hair length
scars
accent
What characteristics are a mixture of genetic and environmental
height
weight
Continous variation is when you can measure a feature e.g. height. what sort of graph would you draw to show class results
A histogram
Discontinous variation is a characteristic that you have or do not have e.g. green eyes.
what sort of graph do you draw to show class results
bar chart
What sort of variation would hair colour be an example of
Discontinuous variation - you either ahve brown hair or not
What sort of variation would foot size be an example of
Continuous variation - you have a range of values
Where do you find all your genetic information
In the nucleus of all cells
What is a chromosome
Found in nucleus
made up of DNA
Sections of a chromosome are called a gene
What is DNA
The genetic material
make up genes and chromosomes
What is a gene
A section of a chromosome that codes for a certain characteristic
In a cell chromosomes always come in pairs or singles
Pairs
How many pairs of chromosomes are there in a human cell
23 pairs
The 23rd chromosome pair in humans are the sex chromosomes. If the person is XX what are they
XX = Female
