Eluviation refers to the leaching of minerals and finer soil particles from the upper layers to the lower layers of soil
Indicate whether the statement is true or false
TRUE
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Misexpression of the Pax6 gene was shown to promote eye development in both vertebrates and invertebrates. The authors of this study suggested that this was evidence that eyes evolved only once. What other evidence contradicts this view?
Pax6 is a transcription factor noted for its unique role in specifying eye development across the animal kingdom. A homologous gene known as eyeless specifies eyes in Drosophila, and misexpression of mouse Pax6 can cause ectopic eyes in flies! This creates a quandary -- how can we explain the universality of the master regulatory gene for eye development, with the striking variability of eye anatomy in different phyla? A. Invertebrates normally have only simple eyespots. B. Many different transcription factors can initiate eye development when misexpressed. C. While the anatomy of all animal eyes is the same, lens proteins vary greatly. D. The anatomical structure of insect, mollusk, and vertebrate eyes are quite different. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about eyes? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Which duct in the male reproductive system will function in both reproduction and urination?
a. Ejaculatory b. Vas deferens c. Seminal vesicle d. Epididymis e. Urethra
What factors contribute to genetic variation in populations?
What will be an ideal response?
Dunaliella salina is a bacterium that is able to live in aqueous solutions with such high salt concentrations that the salt cannot fully dissolve. D. salina is an example of a(n)
A) extreme thermophile. B) extreme halophile. C) methanogen. D) proteobacteria.