Why can the two-locus segregation distorter system in Drosophila exist only when distorter and responder gene are tightly linked?
a. The sensitive allele of the responder gene and the segregation distorter driver allele must al-ways co-occur on the same chromosome.
b. Without tight linkage, the "killing" efficiency of the driver allele would be too low.
c. The driver allele would reduce its own fitness by committing suicide in some gametes.
d. All of the above.
C
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What technique(s) can be used to characterize the phylogenetic composition of a microbial community without culturing any of the members?
A) green fluorescent protein tagging B) stable isotope techniques C) radioisotope experiments D) fluorescent in situ hybridization
Some organisms are able to reproduce both sexually and asexually.
Answer the following statement true (T) or false (F)
What is indicated by the fact that NOT all eukaryotic cells contain both mitochondria and chloroplasts?
a. Endosymbiosis did not occur at all. b. Endosymbiosis occurred only in the evolution of mitochondria. c. Endosymbiosis did not occur in stages. d. Endosymbiosis occurred in stages.
Which of the following statements regarding cyclin D is false?
a. It is required for cell cycle progression. b. It is activated by growth factors. c. It is always present and its activity is regulated by fluctuating levels of Cdk4 and Cdk6. d. It is rapidly degraded following removal of appropriate growth factors.