Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species that lived side by side in parts of their ranges. However , recent books show them as eastern and western forms of a single species, the yellow-rumped warbler. most likely it has been found that the two kinds of warblers

a) live in similar habitats and eat similar foods
b)interbreed often in nature, and the offspring are viable and fertile.
c)are almost identical in appearance
d) have many genes in common
e) sing similar songs

Which of the following is an example of a postzygotic reproductive barrier?

a) Once Ceanothus shrub lives on acid soil , another on basic soil
b) Mallard and pintail ducks mate at different times of year
c) two species of leopard frogs have different mating calls
d) hybrid offspring of 2 species of jimsonweed always die before reproducing
e) pollen of one kind of tobacco cannot fertility another kind.

Biologists have found more than 500 species of fruit flies on the various Hawaiian islands , all apparently descended for a single ancestor species. This example illustrates

a) polyploidy
b) temporal isolation
c) adaptive radiation
d) sympatic speciation
e) postzygotic barriers

A new species C , which formed from hybridization of a species A (2N= 16) with species B (2n =12) would probably produce gametes with a chromosome number of

a) 12
B)24
c)16
d)28
e)56

A horse (2n =64) and a donkey (2n = 62) can mate and produce a mule. how many chromosomes would there be in a mule's cells

a) 31
b)62
c)63
d)126
e)252

What prevents horses and donkeys from hybridizing to form a new species

a) limited hybrid fertility
b) limited hybrid viability
c) hybrid breakdown
d) gametic isolation
e) prezygotic barrier

Which of the following most likely contributed to the rapid speciation of the hundreds of cichlid species in Lake Victoria?

a) the introduction of the Nile perch
b) the increasingly murky waters resulting from pollution
c) female mate choice based on male coloration
d) a unique mouth and jaw structure that was adaptable to diverse food resources
e) both "c" and "d" probably.

Which of the factors would NOT contribute to allopatric speciation

a) a population becomes geographically isolated from the parent population
b) the seperated population is small , and genetic drift occurs.
c) the isolated population is exposed to different selection pressures than the parent population
d) different mutations begin to distinguish the gene pools of the seperated populations
e) Gene flow between 2 populations continues to occur.