Question

1.we learned in class that complex and energetically expensive traits can be maintained in populations by natural selection. which of the following is the best explanation for this phenomenon?

a)the fitness cost outweighs the fitness benefit of maintaining the trait in the population

b) the fitness benefit outweighs the fitness cost of maintaining the trait in the population

c) both and A and B are correct depending on the population and environment

2. lancelets are lungs

true or false

3. an important part of peripatetic speciations is

a) the formation of physical barrier that fragments a population

b)colonization of islands

c)large population size

d)hybrid breakdown

e)mechanical isolation

Answer 1

Ans1)b) the fitness benefit outweighs the fitness cost of maintaining the trait in the population

Explaination:

a trait which have more fitness benefits than fitness costs are selected by natural selction in population .

Ans2)false.

Lancelets are cephalochordates.

Ans3)a) the formation of physical barrier that fragments a population

Explaination:peripetric speciation involves the small population isolated by any geographical barrier and leads to new species formation from this small population.