Transue-Lecture 1

Transue-Lecture 1 -...

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View Full Document Right Arrow Icon A. Stages of Development 1. Fertilization – 2. Cleavage – 3. Blastulation – 4. Gastrulation – 5. Organogenesis – Differing life History Traits/Strategies Echinoderms frog Chicken Humans Yolk Echinoderms (basically no yolk) o Have to mature quickly because no food Frog (moderate amount of yolk) o Enough energy to grow until tadpole swim around to eat Chicken (enough yolk) o Lot of time not dependent on others o Have food to eat Humans o Similar to echinoderms no yolk o Embryo develops in uterus and is fed there 1. Fertilization i. Gamete anatomy a. Human sperm anatomy 1. Acrosome – structure at tip of sperm – membrane sac (vesicle that contains digestive enzymes) b. Human egg anatomy (2ndary oocyte) 1. clear area around egg is non-cellular layer called zona pellucida 2. exterior to that are the granulose cells 3. after ovulation a. corona radioata (granulose cells after ovulations) b. zone peullicida
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