How could parasitism by wasps and feeding by birds result in a higher percentage of galls of medium
size rather than small or large galls, or an even percentage of all sizes of galls, made by a gall-making
fly?
What will be an ideal response?
If wasps preferentially parasitize fly larvae in small galls and birds preferentially eat fly larvae in large
galls, stabilizing selection favors medium-sized galls. That is, the opposing forces of directional
selection for small or large galls creates selection for the gall-making fly to make a higher percentage
of medium sized galls.
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Sterility of a laminar flow hood is accomplished by filter-sterilized air passed through the hood quickly enough that non-sterile air does not flow into the work area
Indicate whether the statement is true or false.
Passive immunity provided to newborns through the placenta belong to the _____ class of immunoglobulins.
What will be an ideal response?
Plasma membrane glycolipids are found
a. exclusively in the inner leaflet. b. exclusively in the outer leaflet. c. equally distributed between the inner and outer leaflets. d. only on the basal surface of epithelia.
Transposons are part of a class of DNA known as
a. nonrepetitive DNA. b. moderately repetitive DNA. c. SNPs. d. minisatellites. e. highly repetitive DNA.