Chapter 22: Descent with Modification: Answers EVEN

2)  the fossil record.

4)  Earth is 6,000 years old, and populations are unchanging.

 6) Variations in the development of the structures occur as the embryos grow. 

 8) Charles Lyell

 10)  Alfred Wallace

 12)  more recently they shared a common ancestor. 

14)  individuals must adapt to their environment.

 16)  island forms and mainland forms descended from common ancestors.

 18)  by identifying the bones as being homologous    by proposing that humans, bats, and dolphins share a common ancestor

 20) baleen whales are descendants of toothed whales.

22) DNA or RNA analysis

24)  The amount of available food may have increased. The number of predators may have decreased. The squirrels of subsequent generations should show greater levels of variation than previous generations because squirrels that would not have survived in the past will now survive.

 26)  Of the following anatomical structures, which is homologous to the wing of a bat?

arm of a human


:The Evolution of Populations

 2)  blending hypothesis

 4) It exemplifies the tentative nature of scientific knowledge.

 6)  diploidy 

 8) a change in the gene pool of a population due to differential reproductive success

 14)  greater than 0.64

16)  interphase

18) It is the differential survival and reproduction of the most fit phenotypes.

20) an increasing mutation rate

 22) gene pool.

24)  natural selection.

26)  0.1 a,  0.9 A

 28)  d

 30)  b

 d 32)  d

34) 0.80

36)  0.600

 38)  1,920

40) 0.60

 42) the frequency of all genotypes must be equal.

44)  42