BIOL 1902 Lecture : wk 7.doc

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taupezebra881

29 Mar 2012

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Live plants as food: all parts of plants are food for animals. Physical problems to overcome: tough tissues due to structural components. Adaptations to break off and then break up: snails and slugs: have radula, insects: caterpillars, grasshoppers have mandibles that slice, A) incisors to cut off pieces of plants. Beavers and other rodents - constantly grow and self- Sharpen by: rubbing against each other, structure: dentine and enamel - wear differentially. B) cheek teeth = molars, premolars grind and crush. Muscles: huge masseters to power grinding: birds: spruce grouse eats spruce needles - really tough. Ground in gizzard = muscular stomach compartment with. Birds add grit (small stones) to gizzard by eating them. Analogous structures = same function but a different origin. Gizzard, radula, mandibles, cheek teeth all grind and break up plant. Material but all are different parts of the body = analogous. Digestion = breakdown of the structural elements like cellulose.

Related Questions

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)?

Analogous structures

Antonymous structures

Synonymous structures

Homologous structures

11.

Artic foxes have white fur and ptarmigan (birds) have white feathers that help them hide in the snow. Given that their common ancestor did not have white fur or white feathers, these structures are most likely

sister structures

homologous structures

divergent structures

analogous structure

12.

Which of the following statements refers to phylogeny?

		The science of studying the transmission of genetic information.
		The science of classifying organisms.
		method used to organize homologous traits to describe phylogenies using common descendent as the primary criterion used to classify organisms.
		The evolutionary history and relationship of an organism or group of organism.

Make the following false statements true.

1. The major categproes in the system of classification iscalled units.

2. When all the organisms in one taxon ome from a single commonancestor, the taxon is considered to be paraphyletic.

3. Analogous structures are those that have a common ancestrybut different applications.

4.The induced-fit model describes muscle contraction.

greengnu571

1.What are the most commonmisconceptions about evolution and why arethey not valid arguments against evolution?

2.The keycomponent of the theory of evolution is natural selection. Define this process. Why is it commonly knownas âsurvival of the fittestâ? What are examples of factors(selectivepressures) that driveevolution of populations?

3.What is the indirect evidence of evolution? Whatare homologous andanalogous structures? What isconvergent evolution? How does similarityof proteins between different species support the idea ofevolution?

pucechinchilla355

BIOL 1902 Lecture : wk 7.doc

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