The descending portion of the loop of Henle is
A. permeable to water and impermeable to sodium.
B. permeable to water and permeable to sodium.
C. impermeable to water and permeable to sodium.
D. impermeable to water and impermeable to sodium.
E. the site of active transport of water.
A. permeable to water and impermeable to sodium.
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The snakes include some rather short and some incredibly long species, with a variation from about 100 to over 300 vertebrae. What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?
A. Changes in genes that lay down extracellular matrix in bone B. Changes in genes necessary for neural crest development C. Changes in genes that control mitosis D. Changes in the somitogenesis clock 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 the development of vertebrae? 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?
Gene flow
a. has a homogenizing influence on a population. b. speeds up the divergence of two populations. c. increases the genetic variation between populations. d. is promoted by isolating mechanisms. e. promotes inbreeding.
Genes on the same chromosome are more likely to assort independently if
A) they are next to one another. B) they are nearby one another. C) they are located far apart. D) they code for similar traits. E) they code for traits that affect the same part of the body.
What is a method of determining the genotype of an individual with a dominant phenotype?
A. Monohybrid cross B. Testcross C. Law of segregation D. Genetic analysis E. Genetic fingerprinting