A cross was made between homozygous wild-type female Drosophila and yellow-bodied male Drosophila. All of the resulting offspring were phenotypically wild type
Offspring of the F2 generation had the following phenotypes:
Sex Phenotype Number
male wild 96
male yellow 99
female wild 197
Based on this information:
(a) Is the mutant gene for yellow body behaving as a recessive or dominant gene?
(b) Is the yellow locus on an autosome or on the X chromosome?
(a) recessive
(b) X chromosome
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Which statement most closely expresses our present understanding?
A) The chloroplast is an ancestor of the cyanobacteria. B) The cyanobacteria are descendents of the chloroplast. C) The chloroplast arose from the incorporation of a cyanobacterial-like organism. D) The chloroplast and the cyanobacteria are not closely (or specifically) related.
Which of the following is not a characteristic of lipid A?
A. Toxic in nanogram amounts B. Heat stable C. Weakly immunogenic D. Neurotoxic
Bacteria that have a spherical shape are called ________.
A. coccus B. bacillus C. spheroid D. spirillum
Radiometric dating
a. is based on the premise that each isotope decays at a constant rate. b. is unpredictable because changes in temperature and pressure alter the results. c. can be used to date sedimentary rock. d. has a large error factor. e. is used for dating only recent fossils.