lesson 7 quiz

what dies the biological species concept use as the primary criterion for determine species boundaries ? - niche differences - molecular (dna, rna, and protein) similarity - gene flow - geographic isolation - morphological similarity

gene flow

which is the first step in allopatric speciation ? - physical isolation of two populations - loss of genetic variation due to genetic drift - genetic divergence due to mutation - differential natural selection in different environments

physical isolation of two populations

which mechanism of reproductive isolation causes postzygotic isolation ? - mechanical isolation - habitat isolation - hybrid sterility - temporal isolation

- hybrid sterilization (zygotes can be formed, but hybrid offspring are sterile as adults, resulting in reproductive isolation of the 2 populations)

three populations of crickets look very similar, but the males have courtship songs that sound different. what function would this difference in song likely serve if the populations came in contact ? - a behavioral reproductive isolating mechanism - a temporal reproductive isolating mechanism - a gametic reproductive isolating mechanism - a postzygotic isolating mechanism

a behavioral reproductive isolating mechanism

which statement is correct ? - a monophyletic group consists of all the descendants of an ancestral population - a monophyletic group is a theoretical idea that does not exist in the real world - a monophyletic group may include an ancestral population and some, but not all, of its descendants - a monophyletic group consists of an ancestral population, all of its descendants, and only those descendants

a monophyletic group consists of an ancestral population, all of its descendants, and only those descendants

which of the following describes vicariance ? - individuals colonize a novel habitat - individuals disperse and found a new population - small populations coalesce into one large population - a population is fragmented into isolated subpopulations

a population is fragmented into isolated subpopulations

which factors are often associated with speciation events in island-dwelling species, such as the galapagos finches studied by rosemary and peter grant ? - vicariance and colonization - hybridization and mutation - mutation and dispersal - dispersal and colonization

dispersal and colonization

which of the following describes dispersal ? - a population is fragmented into isolated subpopulations - small populations coalesce into one large population - individuals disperse and found a new population - individuals colonize a novel habitat

individuals colonize a novel habitat

what distinguishes a morphospecies ? - it is a fossil from a distinct time in earth's history - it is reproductively isolated from other species - it represents a distinct branch in a phylogeny of populations - it has distinctive characteristics, such as size, shape, or coloration

it has distinctive characteristics, such as size, shape, or coloration

which of the following groups could be identified using the biological species concept ? - bacteria living today - lizard species living today - extinct dinosaurs -sunflower species living today

lizard species living today; sunflower species living today

which of the situations below describes vicariance ? - a small group of finches is blown from the mainland to a recently formed volcanic island - four moose are transported from new brunswick to newfoundland, where they establish a large population - american bullfrogs expand their range into british columbia - the grand canyon forms, separating two populations of squirrels on the north rim and the south rim

the grand canyon forms, separating two populations of squirrels on the north rim and the south rim