Across
- 4. having two different alleles for a trait
- 5. pair of complementary nitrogenous bases in a DNA molecule
- 6. when there are three or more alleles for a trait
- 7. two part scientific name that includes genus and species
- 9. trisomy 21
- 12. one allele is not completely dominant over the other
- 13. branching diagram the represents the evolutionary history of a group of organisms
- 19. having two identical alleles for a trait
- 22. reproductive cells, created by meiosis
- 23. key used to identify organisms
- 26. cell division that creates gametes for sexual reproduction
- 27. making a copy of DNA
- 28. two alleles are equally dominant
Down
- 1. different structure, similar function
- 2. three letter sequence of mRNA that codes for an amino acid
- 3. survival of the fittest
- 8. strand of DNA whose sequence can base pair with the sequences found in another DNA strand
- 10. carries DNA's message from the nucleus to the ribosome
- 11. variations of a gene
- 13. physical expression of a genotype
- 14. sequence of DNA that codes for a protein and, thus, determines a trait
- 15. brings amino acids to the ribosome
- 16. process in which homologous chromosomes exchange portions of their DNA during meiosis
- 17. similar structures, different functions
- 18. the process of using the DNA sequence to build a complementary mRNA sequence
- 19. a set of two chromosomes, one from each parent, with similar structures and genes
- 20. genetic makeup or allele combination for an organism
- 21. a gene found on the X chromosome
- 24. the process in which a ribosome reads a sequence of mRNA and uses it to create a protein
- 25. trait controlled by multiple genes; leads to a range of phenotypes