TEST 2 QUESTIONS!

TEST 2 QUESTIONS! - From test 2 key point in Darwins...

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From test 2 key point in Darwin’s explanation of evolution is that -slight variations among individuals significantly affect the chance that a given individual will survive in its environment and be able to reproduce an evolutionary tree 1. shows evolutionary relatedness Darwin noted that all populations have potential to grow 1. exponentially, but that in nature most populations grow more stable over time homoplasy can’t result 2. in decent from common ancestor when comparing humans and chimps with dogs and cats, a species homologous trait would be -hands to grasp any two structures derived from a common ancestor -traits are said to be homologous when attempting to group species scientist use -fossils, gene, physical structures how does modularity allow gene duplication to cause structural changes -gene duplications that occur in one module of organisms don’t disrupt development in other modules the genome encodes instructions for making -enzymes, receptors, signal molecules, structural molecules insects don’t have abdominal legs because -the mutated ubx gene represses expression of dll gene besides insects, most arthropods have abdominal legs because 3. normal ubx gene doesn’t repress expression of dll gene in chicken, absence of expression of gremlin gene leads to -separation of toes in adult a monophyletic group containing all the descendants of a particular ancestor and no other organism is also known as - clade in a cladistic classification each taxon
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-a single lineage include all and only descendants of single ancestor most taxonomists today believe that classification systems should be -monophyletic which is false about classification 4. family have more members than phyla a taxon consisting of members that don’t share the same common ancestor is - polyphyletic bilateral symmetrical animals can be divided into two groups based on evolutionary lineages that separate in Cambrian. These two differ in their -early embryological development which trait not shared by all animal -a complete gut cephalization is most associated with 5. bilateral symmetry which of these feature is a shared, derived trait for animalia 6. similarity in hox genes difference between coelom and pseudocoelom 7. coelom is enclosed by muscle on inside and outside, pseudo only has one layer muscle and rims outside of body cavity not true of members of platyhelminthes 8. they are diploblastic which not associated with sponges 9. mesoderm in free-living flatworms, which occurs by simple diffusion -respiration, absorption of nutrients, excretion, distribution of nutrients body plan of mollusk includes three unique, shared, derived characteristics that support monophylogeny of the group the ___, ___, and _____ 10. foot, radula, mantle which is associated with medusa and polyp stage in typical hydrozoan cnidarian 11. gastrovascular cavity hermaphroditic
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12. leech, earthworm segmented, marine, spiral cleavage, and parapod. most inclusive group -lophotrochozoa which body part secretes shell
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This note was uploaded on 04/14/2009 for the course BIOLOGY 2150 taught by Professor Ernestdubrul during the Spring '09 term at Toledo.

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TEST 2 QUESTIONS! - From test 2 key point in Darwins...

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