Given that loci A and B in Drosophila are sex-linked and 20 map units apart, what phenotypic frequencies would you expect in male and female offspring resulting from the following crosses? (Assume that A and B are dominant to a and b, respectively
)
AaBb (dominant alleles on same chromosome) female X ab/Y male; AaBb (dominant alleles on homologs) female X ab/Y male; aabb female X AB/Y male (no crossing over in male Drosophila)
You might also like to view...
Why don't steroid hormones bind to transmembrane cell-surface receptors?
A. Steroid hormones don't require receptors because they bind directly to the cell's DNA. B. Steroid hormones are not signaling molecules. C. Steroid hormones are nonpolar and therefore cannot bind to receptors. D. Steroid hormones are nonpolar and cross the cell's plasma membrane, binding to receptors inside the cell.
A CD8+ T cell binds to an antigen only if this antigen is____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
The use of enrichment cultures and selective media was pioneered by
A. Pasteur. B. Beijerinck. C. von Behring. D. Jenner.
How are agar plates inoculated for disk diffusion testing of antiseptics and disinfectants?
A four-way quadrant streak is done using a swab. A swab is used to inoculate the entire surface of the plate, producing a lawn of growth. A loop is used to prepare a 4-way quadrant streak. A loop is used to prepare a lawn of growth by inoculating the entire surface of the plate.