Wolf's law
What will be an ideal response?
States that bones grow or remodel in response to demands placed on them. Stress is usually off center, so bones tend to bend. Bending compresses one side, stresses other side. Diaphysis is thickest where bending stresses are greatest. Handedness (right or left handed) results in thicker and stronger bone of the corresponding upper limb. Curved bones are thickest where most likely to buckle. Trabeculae form trusses along lines of stress. Large, bony projections occur where heavy, active muscles attach. Weight lifters have enormous thickenings at muscle attachment sites of most used muscles. Bones of fetus and bedridden people are featureless because of lack of stress on bones. Mechanical stress causes remodeling of producing electrical signals when bone is deformed. Hormonal controls determine whether and remodeling occurs in response to changing blood calcium levels, but mechanical stress determine where it occurs.
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Which interval would likely show the higher ratio of double to single chiasmata?
The Q gene locus is 10 map units from the R gene locus which is 40 map units from the S gene locus: Q——10 m.u.——R——40 m.u.——S A) Q-R B) R-S C) The ratios would be the same in the two intervals. D) Two chiasmata never occur in the same interval.
Birds store most of their waste nitrogen as uric acid
____________________ Indicate whether the statement is true or false.
What unusual feature do you find in connective tissues?
A) extracellular material called the ground substance B) conductive cells C) cells with the ability to contract D) glandular secretions
Suppose a founding population carries an allelic frequency not typical of the original population. Which of the following effects would most likely lead to homogenization?
A) genetic drift within the founding population B) random mating within the founding population C) no mutations within either population D) migration between the original and founding populations E) None of the above.