Biology 1407 Exam 4-Delgado Latest(2024/2025) Updated Questions and Answers with complete solutions.
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Course
Biology 1407 -Delgado
Institution
Biology 1407 -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 ...
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
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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