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Biology 1407 Exam 4-Delgado Latest(2024/2025) Updated Questions and Answers with complete solutions. CA$11.48   Add to cart
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Biology 1407 Exam 4-Delgado Latest(2024/2025) Updated Questions and Answers with complete solutions.
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Hox genes - control the expression of genes that influence animal morphology (sponges are simple animals that do not have Hox genes) acoelmates - triploblastic animals without a coelom, their bodies are solid and have no cavity. Ancestors of animals... - diverged from ancient fungi, between 675 ...

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  • August 3, 2024
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  • 2024/2025
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Biology 1407 Exam 4-Delgado
Hox genes - control the expression of genes that influence animal morphology (sponges are
simple animals that do not have Hox genes)



acoelmates - triploblastic animals without a coelom, their bodies are solid and have no cavity.



Ancestors of animals... - diverged from ancient fungi, between 675 million and 800 million years
ago, believed to be a suspension feeder similar to Choanoflagellates



Animals are.. - -multicellular (without cell walls)

-heterotropic

-develop from embryonic layers

-ingestive



archenteron - pouch that forms during gastrulation (from and indentation called the blastospore)
to become the gut.



Bilateral Symmetry - -have top (dorsal) and bottom (ventral sides), left and right sides, and
anterior/posterior sides

-generally animals that move actively from place to place



Body cavities- coelom - -typical in triploblastic animals

-coelom is fluid or air filled space between digestive tract and outer wall



Body Plan - -a set of morphological traits integrated into a functional whole

-can be used to characterize different types of animal

-includes: symmetry, tissue, body cavities, and early embryo development

, Cambrian period - -led to first arthropods, chordates, and echinoderms

-animals adapted to have hard, mineralized skeletons



Cenozoic Era - -65.5 million years ago to present

-mass extinctions (goodbye dinosaurs)

-mammals grew in size and diversity to accommodate new ecological niches

Tunicates - -have notochord, hollow nerve chord, gill slits, and post anal tail as larvae

-invertebrate

-Phylum urochordata



cephalization - -linked with bilateral symmetry

-concentration of nervous/sensory equipment on anterior end



Choanoflagellates - suspension feeder similar to animalia's common ancestor



Chondrichthyes (sharks, rays) -



Clade Bivalvia (clams) - -feed by suspension, traps fine particles in mucus coating the gills



Clade Cephalopods (Squids) - -not all have shells anymore

-bite at prey with beak like jaw that secretes poisonous saliva



Clade Errantia - -marine and mobile

-most have parapodia: paddle like appendages for locomotion

-parapodium have Chaetae: bristly chitinous projections



Clade Gastropoda (snails and slugs) - -mantle cavity functions as a lung

-feed with radula used for grazing or boring hiles in bivalve shells

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