Question

Q5 

Under allopatric speciation, secondary reinforcement occurs after secondary contact
a when neither a pre-zygotic nor a post-zygotic reproductive isolating mechanism evolves during the period of allopatry 

b. when a pre-zygotic, but not a post-zygotic reproductive isolating mechanism evolves during the period of allopatry
c. when a post-zygotic, but not a pre-zygotic reproductive isolating mechanism evolves during the period of allopatry 

d. when both a pre-zygotic and a post-zygotic reproductive isolating mechanism evolve during the period of allopatry 

e when assortative mating is fully established during the period of allopatry 

Q6 

Obligate endosymbionts that are inherited Strictly from mothers to offspring over very long evolutionary periods 

a. cannot be engaged in mutualistic interactions with their host, because they require nutrients from the host for their own reproduction 

b are also typically inherited from fathers to their sons, via the cytoplasm of the sperm 

c. cannot change the traits their host organisms express 

d. have an association with their host that is not shaped by natural selection, because the association changes the fitness of the endosymbiont, but not fitness of the host 

e often show dramatic shrinkage in their genomes 

Answer 1