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.
2. Polyspermy results in polyandry.
3. Parthenogenesis is when an
oocyte is activated without a sperm.
4. In the cow, after the LH surge,
MPF increases in the preovulatory primary oocyte and causes germinal vesicle
5. In the cow, horse, pig and
sheep, it is the secondary oocyte that is penetrated by the sperm in the
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.
7. Experiments on imprinting have
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.
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.
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.
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.
12. Polarization leads to compaction.
13. Blocks to in vitro development
of embryos occur most often at point when the transition from maternal to
embryonic gene control is occurring.
14. Failure of embryo development
may be due to
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
16. Monozygotic twin calves can
still exhibit fremartinism.