chromosomes
if the alleles are different
a section of DNA that codes for a particular protein
dominant
always expressed, even if only one copy is present
homozygous
long strands of DNA wrapped around a protein
only expressed if two copies are present (therefore no dominant allele present)
gene
genotype
heterozygous
sex cells e.g. sperm and egg
recessive
phenotype
different forms of a gene
If the two alleles present are the same
an organism's characteristics
allele
an organisms genetic make up
gamete
