BIOL 1000 Lecture Notes - Lecture 18: Archaea, Holocene Extinction, Cambrian Explosion

52 views6 pages

rubycrab690

2 Jul 2018

School

University of Manitoba

Department

Biological Sciences

Course

BIOL 1000

Professor

All

For unlimited access to Class Notes, a Class+ subscription is required.

7/2/18

BIOL 1000- EVOLUTION

14.13 MECHANISMS OF MACROEVOLUTION:

•Adaptive Radiation increases diversity.

•Periods of evolutionary change where many new species evolve from a common ancestor.

I. After the colonization of new, unexploited areas.

II. Follows a mass extinction due to vacant ecological niches/roles in communities.

III. Some radiations followed by evolution of new adaptations.

Ex:Colonization of land by plants; wings.

14.14 HYBRID ZONES:

•Hybrid Zones are the regions in which members of different species mate, producing hybrid

offsprings.

find more resources at oneclass.com

Unlock document

This preview shows pages 1-2 of the document.
Unlock all 6 pages and 3 million more documents.

Already have an account? Log in

7/2/18

•Reproductive Isolation: prevents gene flow between populations (species).

• There are 2 modes of tempo of speciation: Punctuated Pattern & Gradual Pattern.

find more resources at oneclass.com

Unlock document

This preview shows pages 1-2 of the document.
Unlock all 6 pages and 3 million more documents.

Already have an account? Log in

Document Summary

14. 13 mechanisms of macroevolution: adaptive radiation increases diversity, periods of evolutionary change where many new species evolve from a common ancestor, after the colonization of new, unexploited areas. Follows a mass extinction due to vacant ecological niches/roles in communities. Some radiations followed by evolution of new adaptations. 14. 14 hybrid zones: hybrid zones are the regions in which members of different species mate, producing hybrid offsprings, reproductive isolation: prevents gene flow between populations (species). There are 2 modes of tempo of speciation: punctuated pattern & gradual pattern. 14. 15 the origins of single celled and multicellular organisms. And the colonization of land were key events in life"s history: macroevolution: is evolutionary change above the species level. Macroevolution encompass- es: the origin of a new group of organisms through a series of speciations events, the impact of mass extinctions on the diversity of life and its subsequent recovery. 14. 16 major event in life history: origin of prokaryotes:

Related Questions

The Cambrian explosion is a prime example of ________________.

		mass extinction
		evolutionary stasis
		a large meteor impact
		adaptive radiation

1 points

QUESTION 2

Most animals are viviparous.

True

False

1 points

QUESTION 3

The first phylum with ganglia in their nervous system are the ________________________.

		Mollusca
		Nematoda
		Bivalvia
		Platyhelminthes

1 points

QUESTION 4

The last common ancestor of all animals was probably a _____________________.

		a unicellular worm
		multicellular algae
		flagellated protist
		multicellular fungus

1 points

QUESTION 5

You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile by use of many short extensions of the cytoplasm. It has well-developed organelles and two nuclei, one large, one small. The organism is most likely to be a ______________.

		foraminifera
		radiolarian
		ciliate
		flagellate

1 points

QUESTION 6

Which of the following organisms would you expect to have the largest surface-area-to-volume ratio? Assume that all of the following are the same total length.

		A mollusc
		A nematode
		A platyhelminth
		Not enough information to determine.

1 points

QUESTION 7

If the animal is a hermaphrodite, it is said to be _______________.

		dioecious
		eutelic
		monoecious
		trioecious

1 points

QUESTION 8

A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange and segmentation. A knowledgeable zoologist should predict that the adults of this species would also feature ____________.

		eight legs
		two pairs of antennae
		a sessile lifecycle
		an open circulatory system

1 points

QUESTION 9

The Phylum Echinodermata exhibits metamerism.

True

False

1 points

QUESTION 10

The existence of evolutionary trends, such as increasing body sizes among horse species, is evidence that _____.

		a larger volume-to-surface area ratio is adaptive in many mammals
		evolution generally progresses toward some goal
		evolution tends toward increased complexity or increased size
		in particular environments, similar adaptations can be beneficial to more than one species

1 points

QUESTION 11

Suppose you are a researcher fro a pest-control company and you develop a chemical that inhibits the develpment of an embryonic mosquito's endodermal cells. Which of the following would cause the pesticide to work?

		The mosquito would develop a weak exoskeleton, making it easy prey.
		The mosquito's gut would not function properly and it would starve.
		The mosquito would not have a properly functioning muscular system.
		Nothing would happen and your experiment would be a failure.

1 points

QUESTION 12

Holometabolis refers to complete metamorphosis.

True

False

1 points

QUESTION 13

Which of these conditions are always true of populations evolving due to natural selection?
Condition 1: The population must vary in traits that are heritable.
Condition 2: Some heritable traits must increase reproductive success.
Condition 3: Individuals pass on most traits that they acquire during their lifetime.

		Condition 1 only
		Condition 2 only
		Conditions 1 and 2
		Conditions 2 and 3

1 points

QUESTION 14

Scientific theories _____. 22.3

		are nearly the same things as hypotheses
		are supported by, and make sense of, many observations
		cannot be tested because the described events occurred only once
		are predictions of future events

1 points

QUESTION 15

The evolution of animal species and their diversity is a result of the evolution of new and different ways to _______________.

		reproduce
		arrange their cells into tissues
		become symmetrical
		form an embyro and establish a basic body plan

BIOL 1000 Lecture Notes - Lecture 18: Archaea, Holocene Extinction, Cambrian Explosion

Document Summary

Get access

Related Documents

BIOL 1000 Lecture Notes - Lecture 17: Sciurus, The Parts Of Animals, Born Naked

Biology 1201A Lecture Notes - Lecture 6: Allopatric Speciation, Divergent Evolution, Punctuated Equilibrium

BIOL 123 Lecture Notes - Lecture 18: Polyploid, Hybrid Zone, Cambrian Explosion

Related Questions