____ speciation is the gradual emergence of two or more species as a result of the geographic separation of two or more groups of animals of the same species
Fill in the blank with the appropriate word.
Allopatric
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What can you infer from this graph?
1.The population no longer exists.
2.6000 individuals is more than the habitat can support.
3.The carrying capacity of reindeer is about 6000 since that is the maximum number that was attained.
4.The population crashed because it had increased far past the number of individuals that the habitat could support, so both 1 and 2 could be inferred from the graph.
Hybridization of closely related plant species by
doubling the chromosome number always results in a. allopolyploids. b. autopolyploids. c. infertile hybrids that must reproduce asexually. d. inviable hybrids. e. hybrids that are similar to only one of their two parents.
lacI codes for a(n) ________, and when lacI is mutated, the lac operon is ________
A) structural gene; never expressed B) repressor; constitutively expressed C) repressor; never expressed D) activator; never expressed E) activator; constitutively expressed
Which of the following is an indirect method for estimating the number of microbes in a sample?
A. viable plate counts B. turbidity C. Coulter counter D. MPN E. membrane filtration