Which of the following observations led to Darwin's major inferences?
a. Members of a population vary in their heritable traits
b. Body parts that are not used deteriorate over time
c. Organisms only go extinct when catastrophes occur
d. Although organisms can produce huge numbers of offspring, many of these offspring do not survive
e. The first and fourth answers are correct
e. The first and fourth answers are correct
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What mechanism used for mobilization of transposable elements can lead to deletions in genomes?
A) Transposase sometimes deletes genomic DNA while removing DNA transposons from the genome. B) Alignment of two transposable elements is required for mobilization and misalignment can result in deletions. C) RNA polymerase transcribes transposable elements; when it makes mistakes, DNA nucleotides are sometimes deleted. D) Piwi RNAs inhibit movement of transposons by deleting DNA that includes and surrounds the inverted repeats.
Four of the five answers listed below are
related. Select the EXCEPTION.
a. jellyfish b. hydra c. tunicates d. corals e. sea anemones
If a plant produces microspores and megaspores, then by definition, it is homosporous
____________________ Indicate whether the statement is true or false.
Based upon the identification of 12 species of Galápagos finches, Charles Darwin hypothesized that the finches were not closely related.
a. true b. false