allele 
amino acid
centromere
chiasma
chromatin
clone
cytoplasm
dominant allele
endocytosis
enzyme
gamete
hemoglobin
homologous chromosomes
hydrogen bond
meiosis
mitosis
mutation
nucleolus
nucleotide
nucleus
plasmid
protein
recessive allele
restriction enzyme
retrovirus
sister chromatids
spindle
trait
transcription
tumor