Unit 7

4. - early stage of embryonic development - follows Blastula - formation of the layers, Ectoderm - mesoderm - endoderm Zygote - initial cell formed after fertilization of egg
7. - early stage of embryonic development, occurs after fertilization of egg + formation of zygote
8. -study of embryos and their development, formation, growth, development
10. small changes in a population
12. group-a scientific naming system used to identify organisms
13. structures organisms have unused organs or structures
14. body structures- same structures can evolve for different uses depending on environmental demand
16. - major group of animals characterized by their embryonic development Derived character - feature present in organism that was absent in last common ancestor group Protostome - characterized from embryonic development - phyla
19. genus species used to make scientific name for organism
20. middle layer in germ layer-gives variety of structures in body
21. genes- master control gene, determines placement and activation development in organism clocks- Randomocks-random mutations accumulate over time at a consistent rate-# of mutations differences can be used to predict when an evolutionary split occurred

1. body structures- different structures can evolve to fulfill similar demands based on environmental demands
2. equilibrium-long periods of equilibrium interrupted by rapid change
3. outermost layer-skin, hair, nails
5. section Binomial nomenclaturee-tries to show ancestry
6. radiation-single species or group diversifies into many distinct forms
9. record-organisms on Earth have been changing as seen in preserved organisms Convergent evolution-organisms under similar environmental pressures evolve similarly
10. small changes over time compound into large changes
11. theory-first eukaryotes evolved from 1 prokaryote living within another
15. -2 species living in close proximity evolve in response to each other
17. -single species or multiple species die out
18. layer-digestive system, trachea, lungs