Embryo Development Review Quiz

 

1. A cow should be inseminated on the evening of the first day observed in estrus and again on the morning of the second day.
True
 False
2. Polyspermy results in polyandry.
True
 False
3. Parthenogenesis is when an oocyte is activated without a sperm.
True
 False
4. In the cow, after the LH surge, MPF increases in the preovulatory primary oocyte and causes germinal vesicle breakdown (GVBD).
True
 False
5. In the cow, horse, pig and sheep, it is the secondary oocyte that is penetrated by the sperm in the oviduct.
True
 False
6. The following sequence of development is correct for the pig; zygote, 2-cell embryo, 4-cell embryo, 8-cell embryo, 16-cell embryo, morula, blastocyst, expanded blastocyst, hatched blastocyst.
True
 False
7. Experiments on imprinting have demonstrated
androgenotes can survive and result in a viable offspring.
 Gynogenotes can survive and result in a viable offspring.
 it is possible to perform pronucelar exchange as long as both a maternal and paternal pronuclei are present in the constructed zygote.
 maternal gene control is essential for embryonic development.
8. Maternal gene control referes to the mRNA and stored proteins that are made in the oocyte prior to ovulation, but control development of the early embryo.
True
 False
9. During the short cell cycles of the early embryo, g1 and the g2/M phases are reduced in length, but the s phase remains unaltered.
True
 False
10. Faster dividing blastomeres move to the center of the developing embryo and give rise to the inner cell mass while the slower dividing blastomeres move to the outside of the embryo and give rise to the trophectoderm.
True
 False
11. The movement of the embryo from the oviduct to the uterus is dependent on a change from an estrogen dominated enviornment to one in which progesterone is the dominant hormone.
True
 False
12. Polarization leads to compaction.
True
 False
13. Blocks to in vitro development of embryos occur most often at point when the transition from maternal to embryonic gene control is occurring.
True
 False
14. Failure of embryo development may be due to
poor development of gap junctions among the outer cells of the late or tight morula.
inability of the embryo to make plasminogen activator.
an inability to activate the embryonic genome.
failure of the calcium wave to inactivate MPF.
15. The embryo forms a blastocoel by pumping sodium and then water into the center of the embryo. The fluid accumulation in the blastocoel is best explained by the presence of
tight juctions.
 gap junctions.
 the zona pellucida.
 greater than 90 blastomeres.
16. Monozygotic twin calves can still exhibit fremartinism.
True
 False