In order to prove genetic recombination occurred through material (DNA) exchange between homologous maize (corn) chromosomes, Harriet Creighton and Barbara McClintock:
A. stained individual chromosomes to see banding, and then observed segregation of bands.
B. observed specific morphologic features of one chromosome being "traded" with its homolog.
C. created mutations of chromosomes via irradiation and observed transfer of damaged DNA between homologs.
D. labeled one chromosome with 32P and observed the transfer of radioactivity to the homolog.
B
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Ribosomes consist of ________ separate subunits that come together as part of the initiation process and dissociate immediately after termination.
A. five B. two C. three D. four
Which creatures belong to the Phylum Platyhelminthes? Check all that apply.
_____ planarians. _____ monogeneans. _____ tapeworms. _____ trematodes. _____ ctenophores.
If the allele or genotype frequencies deviate from the values predicted by the Hardy–Weinberg principle, the
population is: a. growing. b. mutating. c. migrating. d. evolving. e. at equilibrium
Members of the genus Thermomonospora ________.
A. can be isolated in compost piles and hay B. spores can form on either aerial or substrate mycelia C. produce single spores on their mycelia D. All of the choices are correct.