As conservation biologists try to slow the rate of human-caused extinctions, they often have to make hard choices about which habitats and species to save with their limited resources
Your textbook presented the case of the cichlid fishes of Lake Victoria in Africa. Make an argument in favor of either the idea that the recent loss of 200 of the 400 species of recently evolved fish (during the last 14,000 years) due to the introduction of the Nile perch as a food fish is either a minor phylogenetic loss or a tragic loss of an evolutionary hotspot.
What will be an ideal response?
ANS:
Answers will vary, but if in support of this being a minor loss it should include an argument invoking the principles of conservation of phylogenetic diversity. If the argument is in favor of this being a major loss, it should include mention that evolutionary hotspots are habitats where future evolution processes are most likely to occur.
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A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. all members share homoplastic traits. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
The isolation and copying of a gene, usually in large quantities is called gene cloning
Indicate whether the statement is true or false
Primary growth at the apical meristems can produce cells that differentiate into each of these cell types, except which?
A. leaves B. ground tissue C. procambium D. cork cambium E. epidermis
When an electron absorbs energy, it moves to a ________, and when it releases that energy, it ________
a. lower orbital / returns to its original position b. none of the choices c. higher orbital / returns to its original position d. higher orbital / emits radioactivity