Suppose that a homeotic gene from Drosophila is introduced into an Arabidopsis embryo that has a pre-existing mutation in one of its homeotic flower genes. What effect would you expect and why?
A) rescue (or negating) of the phenotype of the mutant because the fly Hox gene supplies the missing protein
B) correction of the sequence in the mutant by recombination with the Drosophila gene sequence
C) expression of the Drosophila homeotic gene correcting the mRNA of the mutant plant
D) a mixture of roughly equal numbers of Drosophila and plant gene product, producing an intermediate phenotype
E) no effect, because Hox genes are different from MADS box genes
E
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Some people can detect PTC, a bitter compound found in broccoli and Brussels sprouts, whereas others cannot. Which of the following is the most likely explanation for this observation?
A. The G protein pathway that alters the conformation of the sodium channels is defective. B. Chemoreceptors specific for PTC are not expressed. C. Too few sodium channels are present in the taste receptors. D. Neurotransmitter release from these taste receptors is impaired.
Four of the five events listed below lead to secondary
succession. Select the exception. a. opening the canopy in a tropical rain forest b. abandoning a cotton field c. retreat of a glacier in Alaska d. a forest fire e. growth of weeds in a lawn that is not mowed
Which biome has the shortest growing season?
a. tundra b. taiga c. grassland d. desert e. tropical rain forest
Competition among individual members of the same species is referred to as ________ competition
Fill in the blank(s) with correct word