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21 Cards in this Set
- Front
- Back
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two types of cloning
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reproductive
therapeutic |
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parthinogenesis
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femaile reproduces without a male...
such as aphid, smome fish, amphibians, lizards and snake, turkeys |
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after 30 hours when zygote moves into uterine tube..
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undergoes first cleavage into two blastomeres...still have zona pellucida
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morula
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ball of 12-32 cells...tight packed in zona pellucida
3 days after fertilization |
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morula becomes what?
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blastocyst stage
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artificial insemination
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collect and concentrate sperm
insert them directly into uterus to increase # of sperm arriving in ampulla of uterine tube |
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gamete intra-fallopian transfer
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GIFT: five superovulatory drugs to female patient, harvest occytes just before ovulation. insert oocytes via uterus directly into uterine tube
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in vitro fertilization
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oocytes combined with capacitated spermatozoa to fertilize in a petri dish outside the womb.
2-3 of them are injected 1 to 8 cell stage into the uterus for implantation...others can be frozen for later attempts |
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frozen embryos
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left-over embryos to blastocyst stage can be cryogenically sotred (using cryoprotectants like glycerol)
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In blastocyst, all cell are still in...
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zona pellucida
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trophoblast
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outer cells of blastocyst---placenta, etc
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embryoblast
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inner cell mass---embryo
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blastocyst does what? by day 5-6
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pops out of zona pellucida
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shedding of the zona ensure what?
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blastocyst can grow and attach
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Why are trophoblast receptors important?
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function is the attachment of the blastocyst
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At implantation you start to develop...
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early hypoblast and embryoblastsyncytiotrophoblast
cytotrophoblast |
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amniotic cavity
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formed at implantation, a small puddle
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embryo has two types of cells
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hypoblast - gut
epiblast-skin |
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trophoblast gives rise to two layers:
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cytotrophoblast (inner)
syncytiotrophoblast (outer layer) |
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What is a yolk sac?
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exocelomic cavity
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day 6-7
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bilaminar embryonic disc is 2 layers of epithelium
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