HSU Zoology 110 sp22 Exam 1 Questions & Answers 2024/2025
preformation view of development? - ANSWERSPreformation - the structure is already seen in the egg or sperm
4 specific developmental differences between protostomes and deuterostomes - ANSWERS-Protostomes use spiral cleavage, deutero...
preformation view of development? - ANSWERSPreformation - the structure is already seen in the egg or
sperm
4 specific developmental differences between protostomes and deuterostomes - ANSWERS-Protostomes
use spiral cleavage, deuterostomes use radial cleavage
-Protostomes undergo mosaic development, deuterostomes undergo regulative development
-In protostomes the coelom forms by schizocoely, in deuterostomes the coelom forms through
enterocoely
-Protostomes form mouth first, deuterostomes for anus first
neurulation and in what group of animals? - ANSWERSthe formation of the central nervous system by
rolling up a tube of ectoderm on the dorsal side of the embryo. It is seen in chordates
histogenesis - ANSWERSthe formation of specific tissues like epithelial and muscle tissue
How does histogenesis relate to cell differentiation? - ANSWERSBecause it requires cells to differentiate
into the functional types of that tissue
ovists - ANSWERSpreformationist who believed the structure lied in the egg
spermists - ANSWERSbelieved the structure lied in the sperm
epigenesis view of development? - ANSWERSEpigenesis- the structure arises and becomes more
complicated during development
regulative development - ANSWERSembryos regulate for parts removed and still develop normally
, mosaic development - ANSWERSembryos with parts removed show defect sin later stages
mode of development for protostomes - ANSWERSmosaic development
mode of development for deuterostomes - ANSWERSregulative development
cytoplasmic determinants - ANSWERSchemicals in cells that affect the fate of daughter cells later in
development
cytoplasmic determinants example - ANSWERSthe polar lobe of cytoplasm of mollusks that is necessary
for mesoderm formation
What is the "organizer"? - ANSWERSthe dorsal lip of the blastopore in amphibian embryos
What experiment did Spemann & Mangold do that showed the "organizers" function? - ANSWERSthey
transplanted it to another embryo and showed that it could organize an entire axis, so that Siamese twin
embryos resulted
How does Spemann & Mangold's experiment exemplify the process of induction? - ANSWERSit displays
how one tissue affects the fate of another, changing it from epidermis into a nervous system
HOX genes - ANSWERShomeobox containing genes that code for proteins acting as transcription factors,
determining segment identity along the anterior-posterior axis.
What animals have HOX genes? - ANSWERSthey are found in all animals and if they are mutated the
segment changes identity and you can end up with legs on your head instead of antennae
What happens if HOX genes mutate? - ANSWERSthe segment changes identity and you can end up with
legs on your head instead of antennae
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