Biology 1001A Lecture : lecture

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cyanwalrus180

10 Feb 2012

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Identify mechanisms involved in a speciation and develop an appreciation of the importance of names of organisms in biology. Biological species concept defines a species as a group of an organism that can successfully interbreed and produce productive offspring. Phylogenetic species concept defines a species as a group of organisms bound by a unique ancestry. Ecological species concept defines a species as a group of organisms that share a distinct ecological niche. Hybridization, when two species interbreed and produce fertile offsprings. Asexually reproducing populations had a higher frequency of mutations in mitochondrial protein- coding genes than sexually reproducing populations. Populations of the same species are said to experience gene flow that mixes their genetic material and could be the glue holding a species together. The process of speciation is frequently defined as the evolution of reproductive isolation between populations. The biological species concept could explain why individuals of species generally look alike.

Related Questions

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

Three of the most prominent definitions of species are thebiological species concept, the phylogenetic species concept, andthe morphological species (morphospecies) concept.

orchidscorpion491

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.

tanpug623

Biology 1001A Lecture : lecture

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