BIO 117 EXAM 1 QUESTIONS AND ANSWERS
100% CORRECT AND UPDATED!!!
, 1) What is evolution? -ANSWER A change in a population over time
2) What is a vestigial trait? -ANSWER Similar in structure, but no longer in use
a. How can these traits used to show change in organisms over time? -ANSWER An
ancient was the first to have this trait; others from that point inherited it, although it may
not be useful any longer
3) Describe the three types of homology discussed in class that are used as evidence for
decent of extant species from common ancestors. -ANSWER Genetic, Structural, and
developmental
a. What was the driving force behind this evolutionary theory? -ANSWER Driven by an
Inner Need
b. What were the major downfalls of Lamarck's ideas? -ANSWER Simple organisms to
Complex organisms in a lifetime
i. Why do we not see evolution at the stage of "individual", but only at the stage of
"population"? -ANSWER Evolution takes generations, not in one organism's life span
5) What is the driving force behind Darwin's theory of Natural Selection? -ANSWER
Decent with modification
6) What is "fitness"? -ANSWER Passing genes to the next generation
8) Natural Selection is considered to be a mechanism of evolutionary change, but there
are many things that Natural Selection can NOT do. We mentioned 4 of these is class,
what are they? -ANSWER 1. Create new traits or alleles
2. Change an organism over its lifetime
3. Make perfect organisms
4. Work without diversity and reproduction
100% CORRECT AND UPDATED!!!
, 1) What is evolution? -ANSWER A change in a population over time
2) What is a vestigial trait? -ANSWER Similar in structure, but no longer in use
a. How can these traits used to show change in organisms over time? -ANSWER An
ancient was the first to have this trait; others from that point inherited it, although it may
not be useful any longer
3) Describe the three types of homology discussed in class that are used as evidence for
decent of extant species from common ancestors. -ANSWER Genetic, Structural, and
developmental
a. What was the driving force behind this evolutionary theory? -ANSWER Driven by an
Inner Need
b. What were the major downfalls of Lamarck's ideas? -ANSWER Simple organisms to
Complex organisms in a lifetime
i. Why do we not see evolution at the stage of "individual", but only at the stage of
"population"? -ANSWER Evolution takes generations, not in one organism's life span
5) What is the driving force behind Darwin's theory of Natural Selection? -ANSWER
Decent with modification
6) What is "fitness"? -ANSWER Passing genes to the next generation
8) Natural Selection is considered to be a mechanism of evolutionary change, but there
are many things that Natural Selection can NOT do. We mentioned 4 of these is class,
what are they? -ANSWER 1. Create new traits or alleles
2. Change an organism over its lifetime
3. Make perfect organisms
4. Work without diversity and reproduction
