A plant breeder can use plum pollen to hand-fertilize an apricot flower. The fruit contains fertile seed that grows into a hybrid called a plucot. However, in the natural environment, plums and apricots bloom several weeks apart
Why are plums and apricots considered separate species?
Because the flowering occurs at two different times, the plants are temporally isolated. This premating isolation mechanism keeps them reproductively isolated in nature, a characteristic of separate species.
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When researchers calibrate the molecular clock they are
A. determining how much time it takes to accumulate a certain percentage of nucleotide changes. B. setting the geological time scale according to the position in which the fossil was found in the rock. C. investigating where the least common ancestor was found. D. generalizing about the amount of time between speciations. E. setting the geological time scale according to the position in which the fossil was found in the rock and investigating where the least common ancestor was found.
Which of the following organelles is not part of the endomembrane system?
A) ribosome B) endoplasmic reticulum C) Golgi apparatus D) lysosome E) secretory vesicle
What are the two basic types of base-pair substitutions?
What will be an ideal response?
An r-selected species typically
A) offers considerable parental care to a small number of offspring. B) has an advantage in habitats that experience unpredictable disturbances. C) is large-bodied, long-lived, and limited by density-dependent factors. D) has an advantage in habitats that experience stable climates.