BIOL1006 Lecture Notes - Lecture 22: Gastrulation, Amphiprioninae, Cnidaria
31 Jul 2018
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"alternation of generations" - dominant diploid form: animal diversity, what defines different animal groups, dominant animal life stage is diploid; only gametes are haploid, animals set aside eggs during development. Protostomes and deuterostomes --> distinguished by development: protostomes: mouth forms from blastopore "first mouth, deuterostomes: anus forms from the blastopore. Lophotrochozoan vs cuticula (ecdysozoans: differentiation is based on dna sequences, molecular phylogenetic analysis, cuticulata have external protective covering produces by the organism itself. Some have symbioltic algae --> zooxanthealle or zoochlorellae. Starfish are still counted due to their bilaterally symmetrical stage during their lifecycle. Chordates - major innovation: possess notochord: flexible, cylindrical rod situates below the nerve cord, provides support and lateral flexibility to the body, allows for the animal so swim (for example) Sex in the ocean: broadcast/mass spawning, female and male gametes are released simultaneously from the same individuals (both hermaphrodites and males and females)
