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4 Cards in this Set

  • Front
  • Back
What are the genetic types of the sperm, egg, and zygote?
Sperm (Haploid, 1n) + Egg (Haploid, 1n) = Zygote (2n, diploid)
What must happen before the sperm can fertilize the egg?
Before sperm can fertilize egg:
1. Capacitation (Weaken acrosome [helmet] of sperm) - by female body acidity
2. Activation by chemical signals = burn more ATP
3. Acrosome recognition reactions
What basic physical feature prevents cross-species fertilization?
Acrosome shape has to match egg shape (no cross species fertilization)
What events occur immediately after fertilization?
After fertilization
1. Block polyspermy (no multiple sperm)
A. Fast block by egg - electrical charge - fries other sperm, created by calcium ions
B. Slow block - Make membrane around zygote (fertilization membrane)
2. sperm head explodes (the one that got in)
3. egg finishes meiosis
4. dna merges
5. cleavage - zygote splits = mitosis
Morula (ball of cells)
Blastocyst - hollow ball, cells start differentiating
6. Blastocyst implants in uterine wall (endometrium)
Bottom of hollow ball becomes trophoblast (eating [burning] into uterine wall)