BIOA01H3 Lecture Notes - Lecture 2: Species, Species Complex, Reproductive Isolation

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26 Sep 2016

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Speciation: the process that produces new and distinct forms of life. Species: difficult to define the word species as it is something that is changing over times. Species, are real biological entities not just a convenient way to group organisms. Species must be able to exchange genetic material by producing fertile offspring. Biological species concept (bsc): species are groups of actually or potentially in- terbreeding populations that are reproductively isolated from other such groups. Members of different species are reproductively isolated from one another. Actually or potentially takes into account that members of the same species may be geographically isolated from one another and therefore not able to breed. The bsc is more useful in theory than practice (difficult to test if species will breed and produce fertile offspring) Morphospecies concept: members of the same species usually look alike. Extended to the dna level > similar dna sequences. However, there may be polymorphisms-species show different phenotypes.

Related Questions

Two populations of birds (one in California, the other in Virginia) appear different from one another with respect to their pattern of coloration, wing shape, and body size. However, when the phylogenetic species concept (as presented in class rather than by our textbook authors) is applied, the bird populations are placed in the same species. Based on that information, what must be true:Answerneither bird population has a fixed unique combination of character states relative to all other populations in that same species the populations are not reproductively isolated from one another (i.e. inter-breeding between them results in fertile offspring)both populations together form a monophyletic group

cyanllama479

1. The vast majority of animals are:

a. mammals b. invertebrates c. vertebrates d. birds

2. Which of the following scientists defined a species as one or more groups of individuals that can potentially interbreed, produce fertile offspring, and do not interbreed with other groups?

a. Charles Darwin b. Carolus Linnaeus c. Mary Leakey d. Ernst Mayr

3.The earliest primitive primates resembled the modern ___________.

a. tarsier b. tree shrew c. old world monkey d.lemur

4. Stromatolites were formed by:

a. animals b. archaebacterial c. cyanobacteria d. red algae

5. Members of the same species would be expected to:

a.look alike b. be reproductively isolated from one another c. share the same gene pool d.have the same phenotype

6. A species is composed of:

a. related organisms b. a group of reproductive females c. populations that have the potential to interbreed and produce fertile offspring d. organisms located in the same habitat

16. Which of the following is not an example of allopatric speciation?

A) The Isthmus of Panama arose 10 million years ago dividing a species of snapping shrimp into two separate populations. Over time, individuals on one side of the isthmus became reproductively isolated from individuals on the other side.

B) A species of hummingbird lives on mainland Costa Rica. Ten individuals make their way to a small island off the coast. Over time these island birds become reproductively isolated from the mainland birds.

C) A squirrel population was divided into two groups because of the formation of the Grand Canyon. Since that time, genetic changes have occurred and the two groups of squirrels are now reproductively isolated from one another.

D) Two populations of deer are separated by a river. Over millions of years, the river dries up. When the two deer populations meet, they are able to interbreed successfully.

E) All of these are examples of allopatric speciation.

Why is D considered allopatric speciation? I thought that D is the correct answer because if the two deer populations are able to interbreed, then speciation did not occur; so it cannot be considered allopatric speciation. â

BIOA01H3 Lecture Notes - Lecture 2: Species, Species Complex, Reproductive Isolation

BIOA01H3 Full Course Notes

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