1. A. Prostaglandins 2. B. Diabetes (Friday Special) 3. E. Dopamine 4. D. Two recessive color blindness alleles on the X chromosomes 5. E. Releasing hormones 6. A. True 7. A. Pheromone 8. D. LDL's 9. C. The placebo effect (Friday Special) 10. A. Kidney stones 11. A. The production of germ cells with half the number of chromosomes found in the parental cells 12. C. Water conservation 13. A. Acetylcholine 14. D. Variable environments 15. E. Anterior pituitary 16. C. Hypothalamus 17. C. 1 in 2 18. B. Intermediate relatedness (third cousins) resulted in the highest reproductive success 19. B. Atrioventricular valves 20. B. The coefficient of inbreeding 21. D. Crossing over of the SRY gene (Friday Special) 22. B. Recessive alleles 23. B. 100% or E. 50% 24. C. Surfactant (Friday Special) 25. B. Urea 26. C. Helicobacter pylori 27. B. Water (Friday Special) 28. E. Antiseptic environments that alter the immune system (Friday Special) 29. B. Tuberous sclerosis 30. A. Formaldehyde 31. D. Malaria 32. E. Creating faceless avatars of actual male dancers which females then rated 33. B. A multiple allele system 34. C. Females are ornamented, males are choosy, and males carry eggs in a brood pouch until hatching 35. C. Inbreeding depression 36. C. Angioplasty 37. C. Modifier genes affect the expression of the tongue-rolling allele 38. A. Release drugs 39. D. Homogametic 40. B. Oligodendrocytes (Friday Special) 41. C. Activation of genes 42. C. Reduced exposure to sunlight by small children (Friday Special) 43. B. Melatonin 44. C. Carbon dioxide levels in the blood rise to high levels 45. D. Ectothermic homeotherms 46. A. Pleiotropy 47. A. Serotonin 48. B. Nitric oxide (NO) 49. B. Ammonia 50. E. Endorphins