Ch. 2- The Pattern Of Evolution

Question 0

Decent with modification

Answer 0

Species change over time

• lineages split and diverge
• new life forms derive from older forms
• all life forms are related
• earth and life are old

Question 1

Special creation

Answer 1

• Species do not change
• lineages do not split
• each species is separately created

Question 2

Species change over time ( microevolution)

Answer 2

-direct observation over time
•artificial selection (dog breeds)
• natural example (field mustard: flowered earlier due to a drought)
-vestigial organs and DNA

Question 3

Lineages split and diverge( speciation)

Answer 3

Can observe early stages in lab and nature

Question 4

New forms evolve from older I ones ( macro evolution)

Answer 4

Fossil records of extinction and succession

• transitional forms

Question 5

Species have common ancestry

Answer 5

Existence of homologous characters, including DNA

•structural homologous : arms in humans, moles, horse, dolphin, and bat have the same type of bones

Question 6

Species have evolved over a very long time

Answer 6

• radio metric data age of earth ~4 billion yr

- earliest life forms about 3 billion yr

Question 7

Darwin’s contributions

Answer 7

• most thorough synthesis to date of evidence for evolution

- the key mechanism:selection