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4 Cards in this Set
- Front
- Back
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What are the genetic types of the sperm, egg, and zygote?
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Sperm (Haploid, 1n) + Egg (Haploid, 1n) = Zygote (2n, diploid)
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What must happen before the sperm can fertilize the egg?
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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 |
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What basic physical feature prevents cross-species fertilization?
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Acrosome shape has to match egg shape (no cross species fertilization)
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What events occur immediately after fertilization?
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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) |
