Across
- 2. having two identical alleles; AA or aa
- 6. having two different alleles; Aa
- 7. the building block of proteins
- 8. the genetic make up or allele combination
Down
- 1. the physcial expression of a trait
- 3. any change in the DNA of a gene or chromosome
- 4. a picture of all the chromosomes in an organism's cell
- 5. things in the environment that cause changes in DNA or RNA and have a negative impact on the organism