BIOL 1070 Lecture Notes - Lecture 5: Speciation
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9.
Snapping shrimp used to be able to swim from the Atlantic Ocean to the Pacific Ocean by traveling between North and South America. However, when the Isthmus of Panama appeared (a land bridge that connects the Americas), the shrimp could no longer travel between the oceans and evolved into different species. This an example of
sympatric speciation | ||||||||||||||||||||||||||||||||||||||
allopatric speciation | ||||||||||||||||||||||||||||||||||||||
punctuated speciation | ||||||||||||||||||||||||||||||||||||||
genetic drift 10. Which of the following refers to a structure that is similar because of descent from a common ancestor (e.g. a human leg and a whale fin)?
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1. Features in two different groups of organisms that are sharedbecause they were inherited from a common ancestor are examples of:(One word. Case does not matter, but you must spell it exactlycorrect.) ____________
2. A phylogeny is:
A. | A diagram showing the relationship between groups oforganisms | |
B. | A list of the evolutionary innovations possessed by a singlegroup of organisms | |
C. | A diagram of all the known ancestors in the fossil record for asingle species living today | |
D. | A unit of time used in geology |
3.
Homoplasy refers to:
A. | The tendency of closely related organisms to interbreed witheach other | |
B. | Features that ancestors had that were later lost by theirdescendants | |
C. | Features in different groups of organisms that are not inheritedfrom a common ancestor | |
D. | Features that appear only in a single group of organisms |
4.
Archaeopteryx lithographica and Tiktaalikroseae are examples of:
A. | Fossils that show early forms of multicellular life in thePrecambrian | |
B. | Transitional fossils that document the origin of evolutionaryinnovations | |
C. | Index fossils that are used to identify the age of rocks | |
D. | Living species that retain primitive characteristics |