In a cross between a male mouse from a true-breeding black strain and a
female from a true-breeding tan strain all of the f1 progeny are gray.
based on the information that you have at this stage, is it possible that a single gene
determines the differences in coat color among the two parental strains and progeny?
if so, what coat colors should appear in the f2 generation and at what frequencies?

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.