Sea urchin - Study guides, Class notes & Summaries

primordial germ cells (PGCs) - specific precursor cells that eventually undergo gametogenesis to become sperm or egg "P granules" - RNA and protein complexes that move to the posterior end of the zygote before the first cleavage and are found in adult germ cells (C. elegans) SOX9 and FGF9 - tfs activated by SRY in males RSPO9 and WNT4 - tfs activated in females Aneuploidy - Abnormal number of chromosomes Mitosis during Gametogenesis - purpose: expand PGC population interphase includes ...

What is marine biology? - The study of life in the sea A subsection of marine science Oceanography - •Geological Oceanography •Physical Oceanography •Chemical Oceanography •Biological Oceanography Why study marine science? - • Diversity! •71% of the Earth's surface is covered by the oceans •Ocean makes up 99% of living space • History! •Life originated in the sea -We still develop in water • Resources! -$20 trillion/year Ancient Marine Science - •Ancient migr...

Study Guide AICE MARINE AS LEVEL EXAM 2024 with 100% Complete Solutions Trophic level - Correct Answer ️️ -"feeding level" in a food chain or food web primary producer - Correct Answer ️️ -autotrophs (self feeders) ex: phytoplankton primary consumer - Correct Answer ️️ -herbivores feed directly on primary producer secondary consumer - Correct Answer ️️ -carnivores that feed on herbivores tertiary consumer - Correct Answer ️️ -carnivores that feed on other carnivores...

CMMB 403 Final Exam New Year 2024 Update | Questions with Answers| Guaranteed Success Mid-blastula transition (MBT) transition from synchronous to asynchronous cell division Blastocoel cavity during development around time of MBT, fluid-filled space; future anus (frog) and future mouth (sea urchin) Gastrulation rearrangement of cell layers during early embryo development; endoderm, mesoderm and ectoderm rearrangment Fate map used at specific stage of embryo development that can tell w...

Why study developmental bio - ANSWER Birth defects, regentitive medicine What does Develop bio include - ANSWER The development of a zygote to an embryo Early D.B - ANSWER All existed from beginning, Microscopes then proved this to be wrong. What is the true way in how we are formed - ANSWER Epigenesis. prved by August weissman Sea urchin experiment. What are the two hypothesies on how cells become different? - ANSWER Regulative and Mosaic Regulative Theory - ANSWER if a part is m...

Marine Biology Latest Update Graded A Sponge Porifera Jellyfish Cnidarian Sea Anemone Where Nemo lives Coral Polyps Start of a coral reef. Nudibranch A shell-less sea snail. Mussels A mollusc with two shells. Squid A mollusc with eight arms and two long tentacles. Cuttlefish Its internal skeleton is the familiar cuttlebone. Sea Star Echinoderm Sea Urchin A marine echinoderm having a spherical or flattened shell covered in mobile spines. Sea Cucumber an echinoderm which has a th...

WSU Biology 106 Exam 3 Questions Marking Scheme Spongocoel - ANSWER- the large central cavity of sponges. water enters the spongocoel through tiny pores called ostia and it exits through the large opening called the osculum. spongocoel is lined with choanocytes which help to create a current in the water. Spicule - ANSWER- structural elements found in most sponges. They provide structural support and deter predators. Large ones are called megascleres while microscopic ones are calle...

What are the main groups in the phylum Echinodermata? - Class Asteroidea - Sea Stars. Class Echinoidea - Sea Urchins, Heart Urchin, and Sand Dollars. Class Crinodidea - Sea Lillies. Class Holothuroidea - Sea Cucumber. How would you know which the oral or aboral surface was on an echinoderm? - The oral surface has the mouth. The aboral surface has the anus. What is pentaradial symmetry? - Five pointed symmetry. Pentaradial symmetry ('penta-' means five) follows a pattern where the parts...

What are the main groups in the phylum Echinodermata? - Class Asteroidea - Sea Stars. Class Echinoidea - Sea Urchins, Heart Urchin, and Sand Dollars. Class Crinodidea - Sea Lillies. Class Holothuroidea - Sea Cucumber. How would you know which the oral or aboral surface was on an echinoderm? - The oral surface has the mouth. The aboral surface has the anus. What is pentaradial symmetry? - Five pointed symmetry. Pentaradial symmetry ('penta-' means five) follows a pattern where the parts...

Gause's principle of competitive exclusion - no two species can occupy identical niches indefinitely when resources are limiting -either they can't exist for a long time or there niches are somewhat different Sympatric species often avoid competition by living in different portions of the habitat, or using different food or other resources Ex: anolis lizards on caribbean island Character displacement differences between symmetric species that are favored by natural selection in order to part...