Which strains' mutations represent a complementation group?
Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-H). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible that all seven strains have mutations in the same gene. Alternatively, some or all of the strains may have mutations in different genes. To determine how many genes are involved in eye color in these flies, all possible pairwise crosses are performed. The offspring phenotypes resulting from each cross are observed. (+ = wild-type; ? = mutant)
A) C, D, F
B) A, B
C) E
D) A, B, E, G, H
D) A, B, E, G, H
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When a neuron membrane potential goes below its resting value it becomes ____
a. depolarized b. hyperpolarized c. repolarized d. damaged e. re-stimulated
Four of the five structures listed below are sinks for
pressure-flow translocation. Select the exception. a. fruits b. roots c. mature leaves d. seeds e. rapidly growing tissue
Meselson and Stahl showed that DNA is replicated by a __________.
a) conservative model b) semi-conservative model c) dispersive model d) semi-dispersive model e) conservative model in prokaryotes and semi-conservative model in eukaryotes
Germany is a very affluent European nation, so we would assume that its ecological footprint would most likely be ________
Fill in the blank(s) with correct word