The three models collectively called showing the stage of development

5. Distinguish between primary and secondary, sex characteristics.?

9. Some biologists contend that the term double fertilization is a misnomer and that the process should be called fertilization and triple fusion. Why do they argue that the fusion of the one sperm nucleus and the two polar nuclei is not fertilization?

3. Study the figure. Then answer the question. This image shows a form of fetal genetic screening done to pregnant females. What is the name of this testing? How does it work?

33. In words and/or a diagram, describe the molecular components of the developmental timing mechanism responsible for the formation of somites of the proper size and placement within the chick embryo. Make sure to include in your answer how the molecular components are coordinated by growth of the embryo to control somite formation: ? How How could this developmental timing mechanism be manipulated to produce longer somites could this developmental timing mechanism be manipulated to increase the rate of somite production ( ,?

What happens in the 3rd- 8th stage of embryonic stage of prenatal development? A major milestone for a 2-3year is? Stress reduction for the missel age adult to help prepare them for retirement could be?

4. Briefly explain how the mutation in one gene can trigger a cascade of genetic impacts in the embryonic development. 5. In one sentence explain why this type of mutations only affect the offspring of the mutant female and not the mutant female herself.

How are teratogens related to critical periods? Q 6 of 15 Teratogens have varying impacts during different stages of development. O Teratogens cause critical periods of development. Critical periods of development contribute to teratogens. O Critical periods are rarely affected by teratogens.

13. ID the blue region at the white

65. Research teratogens and acquired birth abnormalities online. problems in utero as a result.