Exam 4 Review A

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Across
  1. 6. competing for resources within a species; ________ competition
  2. 9. name for the type of covalent bond that joins together nucleotides
  3. 12. Every codon codes for one specific amino acid
  4. 14. competing for resources between different species; ________ competition
  5. 19. sequence of three bases that code for a specific amino acid
  6. 20. copying a specific DNA sequence onto RNA for protein synthesis
  7. 21. Form of RNA that matches amino acids to the appropriate codon on an RNA transcript; tRNA translates the RNA language into protein language
  8. 22. basic unit of heritability; linear sequence of nucleotides at a specific locus
  9. 23. Natural selection favors the intermediate phenotype
  10. 24. Some codons code for the same amino acid
  11. 26. name for the type of covalent bond that joins together amino acids
  12. 27. Relationship in which one species benefits at the expense of the other
Down
  1. 1. _______ operons are on by default. If trp is present, it can push the repressor down to switch the operon off.
  2. 2. Relationship in which one species benefits and the other is unaffected
  3. 3. Natural selection favors the more extreme phenotype in one direction
  4. 4. Individual’s preference to mate with partners who are phenotypically similar or different to themselves
  5. 5. Natural selection favors the more extreme phenotypes in either direction
  6. 7. transfer of alleles or genes from one population to another
  7. 8. Heritable traits that do not involve changes in DNA sequence, such as how DNA wraps around histone proteins
  8. 10. Form of RNA in which a DNA sequence is transcribed onto; mRNA
  9. 11. Widely different phenotypes between the males and females of a species; Sexual _______
  10. 13. _______ operons are off by default. If lac is present, it can pull the repressor up to switch the operon on.
  11. 15. collection of genes in prokaryotes that are controlled by a single “on-off switch” called an operator
  12. 16. Major event kills off many individuals in a population, resulting in a major loss of genetic variation
  13. 17. relating an RNA transcript to the corresponding amino acids
  14. 18. Relationship in which both species benefit
  15. 25. change in allele frequency in a population due to change; Genetic _______