Provide a brief description of segment polarity genes, including their regulation and their molecular and developmental effects
What will be an ideal response?
Segment polarity genes are controlled by transcription factors encoded by the pair-rule genes. Expression of these genes divides the embryo into segments, and the gene products control the cellular identity within each segment.
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A phylogenetic tree is a diagram that describes a phylogeny. A phylogeny is
A. the evolutionary history of a species or group of species. B. the geographic distribution of populations in a species. C. the generations of individuals in a population. D. the distribution of species in a given area in time. E. a list of character traits of individual species set in a tree diagram.
Many plants are filled with toxins that kill or deter herbivores. Many plants sequester these compounds within the cell. Where in the plant cell are these toxic substances most likely stored?
A. Central vacuole B. Mitochondria C. The stroma D. Amyloplasts E. Lysosomes Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about about plant toxin sequestration? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In females, meiosis begins ____ while in males meiosis begins ____
a. before birth; after birth b. at puberty; before birth c. at birth; before birth d. at puberty; after birth e. before birth; before birth
The syndrome known as AIDS is characterized
A. by the presence of HIV. B. as an opportunistic disease resulting from herpesvirus reactivation. C. by CTL attack on CD4 T cells. D. by one or more opportunistic diseases and the presence of HIV. E. by the presence of anti-HIV antibodies.