Movement of individuals into or out of the population, called gene flow, impacts evolution of populations because
A) it can lead to extinction of one or more populations.
B) it may cause genetic drift.
C) it leads to a redistribution of alleles.
D) adaptive radiation results.
E) a founder effect will occur.
C
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A pharyngeal specimen is inoculated on cystine-tellurite blood agar, modified Tinsdale agar, and MacConkey agar. After 48 hours of incubation, black colonies with a brown halo are observed on the Tinsdale agar and gray colonies are isolated from the cystine-tellurite agar. However, no growth is observed on the MacConkey agar. Which one of the following statements explains this discrepancy?
a. The MacConkey agar is most likely ex-pired. b. The MacConkey agar should be incubated an additional 24 hours to observe growth. c. The pH of the media may be altered, causing an environment that is too acidic for the organism to grow. d. No discrepancy is present; this organism does not grow on MacConkey agar.
The echiuran Urechis is also known as:
a. the peanut worm. b. the lugworm. c. the innkeeper worm. d. the beardworm. e. the fan worm.
A major difficulty facing systematists is
A) sequencing DNA. B) distinguishing similar features due to common ancestry from those due to convergent evolution. C) distinguishing anatomy from physiology in plant evolution. D) understanding the sequence of cell divisions in the early embryology of plants and animals. E) placing specimens into the predefined taxonomic categories of species and genus.
Autotomy is the ability of an animal to lose a body part and subsequently regenerate it.
Answer the following statement true (T) or false (F)