Growth and Genetics

  1. Crossing over is when matching chromosomes line up along the equator and exchange genes. When does this occur
    Meosis phase 1
  2. Process in phase 1 of meosis when genes line up along the equator of the cell and exchange genes or groupas of linked genes with one another
    Crossing over
  3. The process by which primitive sex cells already formed in the seminiferous tubules of a new born baby boy later transform into mature sperm/spermatoza
  4. Another name for primitive sex cells
  5. Ususally begins about the time of puberty and continues through a mans life
  6. what process produces spermatoza, gamets of the male parent?
  7. What is the process of producing ova the female parent gamete
  8. What is a mature follicle that is ready to burst open from the ovary's surface
    Graafan Follicle
  9. After leaving the fallopian folicles how long does it live
    1 day
  10. Where does fertilization occur?
    • The outer 1/3 of the fallopian tube
    • Uterin tube
  11. Up to how long after sexual intercourse can a male sperm still fertilize an egg
    3 days, male sperm can live inside thw womans falopian tubes
  12. Anchors the fetus to the uterus and serves as a nutritive bridge
    Function of the placenta
  13. Serves as an excretory, respiratory and endocrine function for the fetus
  14. Seperates the maternal and fetal blood supply
  15. Secretes large amounts of HCG after fertilization, which stimulates the corpus luteum to continue its secretion of estrogen and progesterone
  16. What is the solid mass of cells that form once a zygote begins to cleave or divide
  17. The outer layer cells of the blastocyst are called
  18. The inner cell mass of the blastocyst forms a structure with two cavities called
    • Yolk sac
    • amniotic cavity
  19. what developes from the tropoblast to become an important fetal membrane
  20. An extenstion of the blood vesels of the chronion that brings embryotic circulation to the placenta
    Chorionic villi
  21. What is the length of time period for the embryotic phase of developement
    fertilization to end of 8th week of gestation
  22. What are the primary germ layers
    • 3 layers of specialized cells of the embryo
    • Endoderm
    • mesoderm
    • ectoderm
  23. What structures would be derived from the mesoderm
    • Forms most of the structures between the endo and ectoderm
    • dermis of skin
    • skeletal muscle
    • bones
    • kidneys
    • gonads
    • many glands of the body
    • components of the circulatory system
  24. What is the process of the primary germ layers developing into many kinds of tissue
  25. How many stages of labor are there
  26. Period of first uterine contraction till complete dilation of the cervix
    Stage 1 of labor
  27. Period of time from maximum dilation of cervix till exit of the baby
    Stage two of labor
  28. Period of time of expulsion of the placenta
    Stage 3 of labor
  29. What happens to the head in proportion to the body as age developes
    The head becomes proportionally smaller as body develops
  30. What happens with birth weight during the first 4-6 months
    It doubles
  31. What happens to birth weight during the first year
    it triples
  32. The length of the child increases by how much within the first year
  33. At what age do the decidious teeth begin to appear
    6 months
  34. What happens to the kidneys between the age of 30-75
    # of Functional nephrons decrease by 50%
  35. Fatty acids build up in blood vessel walls and narrow the passageway for the movement of blood often lead to the eventual blockage of the coronary arteries and a "heart attack
  36. Occurs when fatty accumilations and other substances in blood vessels calcify, and cause actual hardening of the arteries
  37. Mature gametes contain how many chromosomes
  38. What is the hapliod number of chromosomes
  39. What is the diploid number of chromosomes
    • 46
    • total number of the human body
  40. A-dominant trait
    a-recessive trait and sickness
    What is Aa
    • Aa- Carrier
    • aa= recessive trait and carrier
  41. Chromotin strand or chromosome is also called or contain
  42. Red-green color blindness affects who more than?
    Males more than females
  43. What can be special about diseased genes
    Can provide some biological advantage
  44. Chromosomal disorder known as Trisomy 21 produces what?
    Down Syndrom
  45. WHat chromosomal disorder is known to cause down syndrom
    Trisomy 21
  46. What mistake in meosis causes Trisomy 21
    Nondisjunction- when a pair of chromosomes fail to seperate
  47. What is it called when a chromosome pair fails to seperate
  48. Inheretance of mtDNA occurs only from whom
    The mother
  49. What is when a gene has a deletion of a single codon, abnormally causes impairment of chloride ion transport accross cell membranes
    Cystic fibrosis
  50. A recessive condition involving the failure to make a subunit of an essential lipid-processing enzyme, hexosaminidase
    Tay-Sachs disease
  51. What percent of DNA carries protien coding genes
    less than 2%
Card Set
Growth and Genetics
A&P Genetics Test