When constructing a phylogeny based on morphological and molecular data, there can be many ways of positioning the organisms in the phylogenetic tree. One concept that scientists apply to help them in this task is 'maximum parsimony', which means that
Answer: The simplest, most obvious sequence of evolutionary events that led to the occurrence of shared traits is probably the correct one.
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According to W. W. Rostow's model of economic development, in order for a country to be ready for "take-off" it must have
A) an investment in manufacturing equal or greater than 10 percent of national income. B) a physical infrastructure and a social/political elite. C) comparative advantages in international trade, which it exploits. D) a majority of the population engaged in tertiary activities. E) a democratic form of government.
Marine snow is an important source of food for many pelagic organisms
Indicate whether the statement is true or false
The small circles of DNA found in bacteria are called GENOMES.
a. true b. false
Where may Muller's ratchet be at work in the genomes of sexually reproducing organ-isms?
a. Y chromosome genes with female-specific function b. Y chromosomal genes with general function c. Autosomal genes of Drosophila males (there is no crossing-over in Drosoph-ila males) d. Nonrecombinant sections of autosomes e. A and B