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12/7/2016
Figure 21.8b
Artificial Selection, Natural Selection, and
Adaptation
†Platybelodon
 Darwin noted that humans have modified other
species by selecting and breeding individuals with
desired traits, a process called artificial selection
†Stegodon
†Mammuthus
 Darwin drew two inferences from two observations
Elephas maximus (Asia)
Loxodonta africana (Africa)
Loxodonta cyclotis (Africa)
60
34
24
5.5 2104 0
Millions of years ago
Years ago
© 2014 Pearson Education, Inc.
© 2014 Pearson Education, Inc.
Figure 21.9
Figure 21.9a
Cabbage
Selection
for apical
(tip) bud
Brussels
sprouts
Broccoli
Selection for
axillary (side)
buds
Selection for
flowers and stems
Selection
for stems
Selection
for leaves
Kale
© 2014 Pearson Education, Inc.
Wild mustard
Wild mustard
Kohlrabi
© 2014 Pearson Education, Inc.