33. List the hormones produced by the placenta. 34. List the substances that can

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33. List the hormones produced by the placenta. 34. List the substances that can pass through the placental barriers. 35. What are the functions of placental hormone human chorionic somatomammotropin (hCS)?. 36. What developmental events occur during weeks 9-12, 13-16, 17- 20, 21-30, and 30-40 of fetal development? 37. List and briefly describe the three stages of labor. Which stage is the longest part of labor? 38. The primary reproductive organ in the human female is the 39. The primary reproductive organ in the human male is the 40. What two systems are first to become evident during embryonic development? What is the time span for limb bud differentiation? 41. What time frame represents the human embryonic period of development? 42. In which structure of the male reproductive system does sperm maturation take place? 43. Define/describe each of the extraembryonic membranes. 44. List the functions of the trophoblasts Chapter 29 45. List the three sources of genetic variation. 46. Define identical/monozygotic and fraternal/dizygotic twins. 47. Recessive genes are usually expressed in humans only when 48. One possible scientific explanation for siblings having very different skin color isL 49. An example of multiple allele inheritance is 50. List and deseribe the disorders that are a result of nondisjunction of sex chromosomes during meiosis (only those covered in this course). 51. List the characteristics of Down's syndrome (both modes of inheritance). 52. In a paternity suit, the man has blood type AB. He could not be the father if the child has what blood type?

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According to the Chegg guidelines I'll answer only the first question when more than one question is posted Post them separately to get the answers.

33) Placenta is an endocrine gland and is present only during the pregnancy. The hormones produced by placenta are estrogen, progesterone and human chorionic gonadotropin

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