Which eye color has the gene combination to
deposit the most melanin in the iris?
a. blue.
b. gray.
c. brown.
d. green.
e. all are the same
C
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Amanda was successfully treated for the P. aeruginosa infection, but on a subsequent visit to
the hospital, she was infected again. With this second infection, her immune system would ____________________.
a. respond more quickly to the antigen b. immediately start to produce memory cells c. have a reduced response due to recognizing the antigen d. not be able to fight off the infection
Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pink flowers. The F1 generation all had dark-blue flowers. When the F1 were crossed with each other, the F2 generation consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, and 10 with pink flowers. How is flower color controlled in phlox?
A) one gene with four alleles B) one gene with two codominant alleles C) two genes whose alleles interact additively D) two genes with dominant epistasis
Which types of fish have gill slits hidden beneath a gill cover?
a. jawless fishes b. cartilagenous fishes c. bony fishes d. sharks and rays e. lampreys and hagfish
Speciation has become complete when
A) two populations of organisms have been separated for a very long time. B) a change in allele frequency has occurred. C) organisms of one population do not recognize the mating call of another population and so mating does not occur. D) offspring of mating from members of two different populations are able to mate with members of either population.