Log in
HomeClass Notes1,200,000CA670,000

BIOL 111 Lecture : Lecture 24 - Speciation.docx

150 views2 pages
magentamink122
7 May 2012
School
McGill University
Department
Biology (Sci)
Course
BIOL 111
Professor
Suzanne Gray

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

ghaniamerabia and 32 others unlocked
BIOL 111 Full Course Notes
44
BIOL 111 Full Course Notes
Verified Note
44 documents

Document Summary

Problems in morphology: sexual dimorphism can be quite large and therefore results in problems when it comes to categorizing through morphology. Juveniles were also classified differently than their adult specie. Example #1: the agelaius phoniceus (male and female) Example #2: domestic dogs: dogs show similar levels of diversity but explore new morphological space. A typical perception of the biological species concept is that it doesn"t allow species to interbreed and produce viable offspring. Biological species concept: groups of actually or potentially interbreeding natural populations, which are reproductive isolated from other such groups. Problems: difficult for allopatric populations and not particularly useful for fossils. Speciation is a process: a barrier is established, the two populations diverge genetically but are still reproductively compatible, reproductive incompatibility is established. Various mechanisms of speciation: uniform natural selection, divergent natural selection (ecological selection, genetic drift, polyploidy, hybridization, sexual selection, cytoplasmic incompatibility. Ecological speciation: disruptive/divergent selection drives adaptive divergence, reproductive isolation evolves as a consequence.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

BIOL 111 Lecture Notes - Lecture 24: Cytoplasmic Incompatibility, Mutation, Polyploid
lemonlion181
BIOL 111 Lecture Notes - Wolbachia, Coevolution, Semen
maroonmallard463
BIOL 111 Lecture Notes - Lecture 40: Agelaius, Anglerfish, Liger
cyanraccoon413

Related Questions

Distinguishbetween morphological, phylogenetic, and biological speciesconcepts. What are the advantages and disadvantages ofeach?

Mules are considered hybrids, not a separate species. Mules result from the joining of gametes from a female horse (n=32) and a male donkey (n=31). For EACH CONCEPT, explain whether it would suggest that a mule is a separate species or not a separate species.

a) Biological Concept:

b) Mate-Recognition Species Concept:

c) Genetic Species Concept:

d) Morphological Species Concept:

e) Phylogenetic Species Concept:

Hundreds of different dog breeds have been recognized, and you have probably already identified your very favorite breed! Historically, dog breeds have been traditionally grouped together as one species. However, there is an ongoing debate about what actually defines a "species." This week, you have learned about several different species concepts (each defining the term "species" based on different criteria.) Refer to the Morphological Species Concept, the Biological Species Concept, and the Phylogenetic Species Concept in your discussion about whether all dogs from all breeds should be grouped as one species.