Possible gamete genotypes produced by an individual of genotype PpDd are
a. Pp and Dd.
b. all PpDd.
c. PD and pd.
d. PD, Pd, pD, and pd.
a
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Why does external fertilization typically occur much more often in aquatic animals than in terrestrial animals?
A) The gametes are hydrophobic, so they must be suspended in water to avoid clumping. B) The gametes must be produced in large numbers, which can occur only in aquatic environments. C) The gametes must be kept wet to avoid desiccation.
Which region of DNA contains the coding information for a protein in a eukaryote?
A. Exons B. Introns C. Enhancers D. Promoters
The initial experiment of Koga and Fugatsu, in testing for any bacterial cause of aphid color change, involved all of these except
A. the specific amounts of red and green pigment molecules were initially measured as dependent variables. B. a group of green aphids was grown, then killed in order to produce an extract to test on red aphids. C. a group of red aphids was treated with the independent variable of Rickettsiella bacteria infection from green aphids. D. a group of red aphids was grown as a control group. E. a group of aphids infected with Rickettsiella bacteria was grown, then killed in order to produce an extract to test on red aphids.
The use of CAP- cAMP complex as a positive regulator is specific to the lac operon
Indicate whether the statement is true or false