| Mutations create variations in a population's gene ____. |
blood |
| Ribosomes are complexes of ____ and protein. |
clone |
| A ____ is an identical genetic copy. |
codon |
| A ____ is a segment of DNA that codes for a trait. |
gene |
| A ____ is a sequence of three nucleotides in DNA or mRNA. |
pool |
| Adenine and guanine are ____ (two rings) nucleotide bases. |
purine |
| The three alleles for human ____ type are named A, B, and O. |
rRNA |
| UAG, UGA, and UAA are ____ codons. |
stop |
