A derived character that is shared by all members of a clade is called a ________ of that clade.
Fill in the blank(s) with the appropriate word(s).
synapomorphy
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Chemicals, secreted by soil fungi, which inhibit the growth of bacteria, are known as _____
A) antibodies B) aflatoxins C) hallucinogens D) antigens E) antibiotics
Beadle and Tatum discovered that metabolic pathways are studied most effectively using which of the following techniques?
A) creating multiple gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway B) adding intermediates to a metabolic pathway C) removing all intermediates of a metabolic pathway D) creating single gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway
Which of the following situations would be MOST likely to produce a new species?
A. A group of polyploid individuals arises by an abnormal meioses. The polyploids can only produce viable offspring by mating with each other. B. Several individuals join an existing population and introduce several new, beneficial alleles. C. Several individuals colonize a new area and establish a population. Migration between the two populations is common. D. An existing species becomes subdivided by a glacier and the resulting groups remain physically isolated from each other for thousands of years. When the glacier melts, the two groups are able to interbreed. E. A volcano erupts and kills all of the frogs on an island, along with many other species. New frogs colonize the island and begin reproducing rapidly because there are no longer any frog predators.
A healthy young couple are both carriers of cystic fibrosis; the chance that each of their future children will inherit this serious illness is Select one:
a. 50%. b. 0%, because cystic fibrosis is not an inherited illness. c. 25%. d. More information is needed about the couple's parents and grandparents to determine probability. e. 100%, because both parents are identified as carriers of cystic fibrosis