Covers why organisms are different topic in Biology GCSE
Define genetic variation?
It means that all animals and plants have characteristics that are in some ways similar to their parents as an organism's characteristics are detemermined by the genes inherited by their parents - the combining of genes from 2 parents cause gentic variation which means no 2 species are genetically identical (apart from identical twins)
What is a gamete?
A sex cell (e.g. sperm or egg)
Name 2 characteristics that are only determined by genes in animals
Eye colour, blood group
Name 2 inherited disorders
Haemophilia, cystic fibrosis
Name 1 characteristic of plant that can only be inherited by genes
Violet flower colour (so colour)
What is environmental variation?
The environment that organisms live and grow cause differences between members of the same species - this is called environmental variation
Give 1 example of an environmental variation in plants
Having yellow leaves
Give 2 examples of an environmental variation in animals
Losing your toes, your accent
Most characteristics are due to a mixture of...
Genes and the environment
Give 1 example of an animal being affected by genes and the environment
The maximum height of an animal is determined on it's genes but whether it grows to that height depends on its environment (if it gets enough food)
What is inside your nucleus?
Genetic matieral in the form of chromosomes
How many chromosomes does a human cell's nucleus contain?
23 pairs of chromosomes (46 in total)
What do chromosomes carry?
What do genes control?
They control the development of different characteristics e.g. hair colour
A gene is a......length of the chromosomes
The DNA is coiled up to form the arms of a...
What are different versions of the same gene called?
In size order from biggest to smallest sort: DNA, nucleus, gene, chromosome