Question

39. Which of the following is true about cleavage of the zygote? a. each cells division results in smaller cells b. the cells resulting from cleavage are diploid (contain a maternal and paternal set of chromosomes) c. both statements are true d. neither statement is true

40. Which of the following is not true about implantation? a. would normally occur about 7 days after ovulation b. would normall occurs about 6 days after fertilization c. would normally occur about 21 days into the mentrual cycle d. requires attachment of the blastocycst to the endometrium e. usually occurs in the uterine (Fallopian) tube

41. An ectopic pregnancy is a. when the fetus is born feet first b. when the fetus is born prematurely c. any pregnancy resulting in twins or multiple births d. any pregnancy which lasts more than 40 weeks e. development of the embryo or fetus outside the uterine cavity

42. The gestation period in humans is about a. 9 hours b. 24 hours c. 48 hours d. 7 days e. 14 days f. 28 days g. none of the above

Answer 1

39 ) Answer C Both statements are true

Zygote is formed by fertilisation of sperm and ovum .Zygote is diploid cell following cleavage of zygote 2 celled stage is formed which are smaller in size and each cell have both maternal and paternal set of chromosomes .

40 ) Answer E Usually occurs in uterine ( Fallopian tube )

Implantation usually occurs on 7-8 days after ovulation which is Around 6-7 days after fertilisation and around 2O day of menstrual cycle .Implantation occurs in endometrium of uterus posterior wall of body of uterus close to Fundus .

Implantation - 7-8 days after Ovulation . Fertilisation occurs after 24 hrs so it becomes 6-7 days after Fertilisation .If we calculate the menstrual cycle then Ovulation is on Day 14 and implantation on day 7 so total of 21 st day of menstrual cycles.

41) Answer E) Development of embryo or Fetus outside uterine cavity .

Normally implantation occurs in endometeium of uterus .Any deviations from this place of Implantation is ectopic pregnancy .

A) False statement when feet comes first then it is Breech presentation

B) False Baby born premature - Premature birth nothing to relate with ectopic pregnancy

C) False Multiple births twins not related to ectopic .

D) False pregancy lasting for more than 40 wks it is going towards postterm .

42) G)None of the above

The Period of gestation is around 40 weeks ( 37-42 wks ) 9 months the period of development of fetus from Conception till birth .