Flashcards in Variation Deck (17)
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
An organisms characteristics are controlled by its...
An organisms genes are _______ from its parents
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?
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
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
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.
Who are the only people who have no genetic variation at all?