The Origin of Species

Which of the following are prezygotic barriers?

• behavioral isolation

• hybrid breakdown

• mechanical isolation

• reduced hybrid fertility

• reduced hybrid viability

Tags

NGSS.HS-LS4-4

What type of isolation occurs when sperm of one species may not be able to fertilize the eggs of another species? (You have to spell this correctly to get it correct.)

Strains of cultivated rice have accumulated different mutant recessive alleles at two loci in the course of their divergence from a common ancestor. Hybrids between them are vigorous and fertile, but plants in the next generation that carry too many of these recessive alleles are small and sterile. This is an example of

• reduced hybrid viability

• reduced hybrid fertility

• hybrid breakdown

• temporal isolation

In North America, the geographic ranges of the western spotted skunk and the eastern spotted skunk overlap, but the western spotted skunk mates in late summer and the eastern spotted skunk mates in late winter. This is an example of

• behavioral isolation

• habitat isolation

• mechanical isolation

• temporal isolation

requires geographic isolation

• allopatric speciation

• sympatric speciation

• both

occurs in same geographic area

• allopatric speciation

• sympatric speciation

• both

Tags

NGSS.HS-LS4-4

Autopolyploidy in a field of strawberry plants may lead to

• allopatric speciation

• sympatric speciation

• both

Tags

NGSS.HS-LS4-5

Select ALL that can result in allopatric speciation.

• genetic drift

• gene flow

• natural selection under different environmental conditions

• sexual selection

Tags

NGSS.HS-LS4-4

Select ALL that can result in sympatric speciation.

• gene flow

• natural selection under different environmental conditions

• polyploidy

• sexual selection

strengthening of prezygotic barriers - hybrids gradually cease to be formed in hybrid zone

• fusion

• reinforcement

• stability

Tags

NGSS.HS-LS4-4