What is the genome?
It is all the genes in a nucleus
It is all the genetic material in an organism
It is all the DNA in a human being
Where is the DNA in eukaryotes found?
In the nucleus
In the cytoplasm
Eukaryotes do not possess DNA
Why is phenylketonuria an example of how variation can be caused by the genes and environment working together?
Phenylketonuria is caused by a defective gene which codes for a defective enzyme
Phenylketonuria only develops when someone eats food containing phenylalanine
Individuals with a defective PAH gene cannot metabolise phenylalanine and so must exclude it from their diets to stay healthy
What is a gene?
A small section of DNA that codes for a protein
An x-shaped coil of DNA
A complete copy of an organism’s DNA
What percentage of DNA codes for genes?
100%
1.5%
98.5%
What term is given to the fusion of gametes?
Transpiration
Enucleation
Fertilisation
What do scientists use to look at inheritance of genetic disorders?
Family tree
Pedigree chart
Microscopes
Which of these is an example of genetic variation?
Scars
Tattoos
Ability to roll tongue
Which of these is an example of environmental variation?
Blood group
Sex
Which of these is an example where genetic and environmental variation are factors?
Weight