Lecture 4

Front 1

Many scientists believe that the Cretaceous mass extinction was caused by ________.

Back 1

an asteroid impact

Front 2

The fossil record represents ________ of the total species that have ever lived.

Back 2

less than 1%

Front 3

Carbon 14 (14C)

Back 3

can be used to determine the age of organic material in a fossil

Front 4

In plate tectonics:

Back 4

1. Continents have assumed various shapes over time.

2. evolution of life on Earth.

3. Continental drift is the movement of the plates, which carry continents with them.

4. Earth's crust is broken into large, rigid plates.Hide Feedback

Front 5

Continental drift affects:

Back 5

1.sea levels

2.extent of glaciations

3.climate

4.evolution

Front 6

When a species lives in suitable habitats throughout a geographical area they have ________.

Back 6

continuous distributions

Front 7

The movement of organisms away from their place of origin is a ________.

Back 7

dispersal

Front 8

________ occurs when distantly related organisms evolve similar adaptations to similar environments.

Back 8

Convergent evolution

Front 9

________ species occur in one area and nowhere else on Earth.

Back 9

Endemic

Front 10

What results when one species rapidly gives rise to a cluster of closely related species that occupy different ecological niches?

Back 10

1.increased biodiversity

2. speciation

3. evolution

4. adaptive radiation

Front 11

A mass extinction is:

Back 11

a time when many species become extinct

Front 12

Which of the following statements about of the evolution of horses is false?

a. Early equine ancestors were browsers, not grazers.

b. Hyracotherium is the earliest known ancestor of the horse.

c. As the evolution of the horse progressed there was a reduction in the number of toes in some lineages.

d. The evolution of the horse is characterized by a smooth pattern of increasing size across species.

e. The true horse, Equus, emerged during the Pleistocene.

Back 12

The evolution of the horse is characterized by a smooth pattern of increasing size across species.

Front 13

________ proposes that morphological change occurs slowly over long periods of time.

Back 13

The phyletic gradualism hypothesis

Front 14

Punctuated equilibrium states that:

Back 14

The tempo of evolution is sporadic.

Front 15

Allometric growth:

Back 15

is the differential growth of body parts

Front 16

When angiosperm diversity increased, the diversity of which other species declined?

Back 16

conifers

ferns

cycads

ginkgos

Front 17

________ code for transcription factors that either activate or repress genes that contribute specifically to an organism's developmental form.

Back 17

Homeotic genes

Front 18

The function of the homeobox sequence of a Hox gene is to ________.

Back 18

1. serve as a toolkit gene

2. produce a DNA-binding protein that activates or represses a downstream gene

3. encode a homeodomain that functions as a transcription factor

4. specify where on the body appendages will develop

Front 19

The function of homeotic genes is to encode ________.

Back 19

transcription factors

Front 20

Fossils:

Back 20

preserve hard body parts most efficiently