In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere.
B. occurs along the primitive streak in the animal hemisphere.
C. is impossible because of the large amount of yolk in the egg.
D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore.
E. occurs within the inner cell mass that is embedded in the large amount of yolk.
D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore.
You might also like to view...
Which one of the following is not required for a plant to grow and reproduce?
A. hydrogen peroxide B. carbon dioxide C. water D. light E. basic nutrients
What are the different versions of the same gene?
A) alleles B) diploids C) homologous chromosomes D) sister chromatids
Which region of the Earth receives the least amount of solar radiation during the winter solstice?
A. Southern Hemisphere B. Northern Hemisphere C. equatorial regions D. between 30° North and 30° South E. All of the Earth's regions receive the same amount of solar radiation during the winter solstice.
Which of the following is known as the "Age of the Modern Man?"
a) Mesozoic Era b) Cenozoic Era c) Paleozoic Era d) Cretaceous Era e) none of the above