Variation Flashcards
What does variation mean?
Differences between organisms
What does genetic variation mean?
Differences caused by the genes we inherit
What does environmental variation mean?
Differences caused y the environment we live in
What is meant by the ‘characteristics’ of organisms?
Their features e.g. eye colour, height etc.
Name the 2 types of variation
Genetic variation
Environmental variation
An organisms characteristics are controlled by its…
genes
An organisms genes are _______ from its parents
inherited
Why does an organism look like both parents?
Because the genes of both parents mix during fertilisation.
What is fertilisation?
When a sperm enters an egg
What is the scientific name for eggs and sperm?
Gametes
Why are brothers and sisters not identical?
Because they receive a different mix of genes from their parents
Which human characteristics are controlled only by genes?
Natural hair colour
Natural eye colour
Blood Group
How can a persons weight be affect by genes AND the environment?
Access to more or less food in their environment
Weight is inherited from parents genes.
How can a persons nose shape be affected by genes AND the environment?
May break nose due to environment
Surgery
Nose shape is inherited from parents genes.
How can the height of a plant be controlled by genes AND the environment?
Plant height genes are inherited from parents.
Access to sunlight or nutrients in the environment.
