The maintenance of genetic variation in sea-squirts (Botryllus scholosseri) has been studied by Richard Grosberg. Interestingly, these sea-squirts have two genetically determined life history forms
In one, called ________ the modules in a colony reproduce once and then die. In the other morph, called ________ colonies reproduce sexually at least three times before they die. Fill in the blank(s) with correct word
semelparous; iteroparous
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An organism that is made up of a fungus and an associated green alga or cyanobacterium is
(a) sac fungus. (b) lichen. (c) mycorrhizal root. (d) club fungus.
Which of the following does NOT cycle
through an ecosystem? a. water b. carbon c. energy d. phosphorus e. nitrogen
The two main stages of cell division are called
A) mitosis and interphase. B) synthesis and cytokinesis. C) the M phase and the S phase. D) mitosis and cytokinesis.
Mutagens are useful in biotechnology research for
A. producing organisms with altered phenotypes. B. producing new organisms which have beneficial traits from two or more organisms. C. selecting genetic mutants resistant to radioactivity. D. removing undesirable traits from microbes. E. producing DNA fragments for cloning.