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LINKS to more puzzles: Chapter 1 Chapter 2a Chapter 2b Chapter 3a Chapter 3B Chapter 4a Chapter 4b Chapter 5b |
LINKS to related sites: aCross Development home page: Tosney home page Society for Developmental Biology Gilbert’s textbook home page Sinauer |
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1 the _ _ _rease in cytoplasm volume relative to nuclear volume may help trigger the first gene transcription 2 central cavity inside a blastula 9 cells of the tunicate Styela partita that receive _ _llow cytoplasm become mesoderm 10 the _ _imal pole is the yolk-poor pole of the egg, zygote and cleaving embryo 11 in _ _i_ _ _ cleavage, cells cleave at oblique angles and form a stereoblastula, as in annelids, flatworms and many molluscs 15 ___ pressure may help expand the sea urchin blastocoel during later stages 18 embryonic portion of the placenta, enables the embryo to get oxygen and nutrients from mom, and secretes hormones to assure embryo retention 21 in _e_olecithal eggs, a dense yolk lies to one side, as in reptiles, fish and birds 22 yolk distribution will affect the _ _mmetry of cleavage 24 anagram for synonym of sinistral 26 an ass_ _ is a test 27 copy to, abbrev 29 in _ _ _i_l holoblastic cleavage, the cleavage furrows are oriented parallel to and perpendicular to the animal-vegetal axis of the egg 30 small spot 32 vertebrate embryos containing 16-64 cells, after the Latin word for the "mulberry" that they are said to resemble 33 is, plural form 35 _acr_meres are large blastomeres formed by unequal cleavages in the vegetal pole of sea urchins 36 the b_ _ _ _ocyst is produced by cavitation in the morula, as fluid secreted by trophoblast cells accumulates 37 the hya_ _ne layer is a non-cellular layer necessary for blastocoel expansion in sea urchins 38 hit, as in cartoons 41 old, used cloth 42 enzyme secreted by the trophoblast during mammalian implantation that helps digest the extracellular matrix of the uterine wall 45 in the meridi_ _al cleavage pattern, the cleavage furrow passes through animal and vegetal poles, like a meridian on a globe 46 a fr_ _ _ _ is a disorderly fight 47 in _ _roblastic cleavage, the cleavage furrow fails to penetrate the yolky cytoplasm 48 relative size of blastomeres formed during early radial holoblastic cleavage 51 the _ro_hect_derm is the outer layer of cells formed during mammalian cleavage 52 the ___ cell mass will form the entire mammalian embryo, the yolk sac, allantois and amnion 54 bilate_ _ _ holoblastic cleavage is typical of ascidians 55 the direction of coiling in snail shells is determined by this individual's genome 56 if mRNA for EP-cadherin is destroyed, the blastula will lo_ _ its blastocoel 57 mammalian eggs may contain ___ numbers of cells because the divisions are asynchronous 58 in the _ _ _ _blastic cleavage pattern, the cleavage furrow extends through the entire egg 60 a ste_ _ _blastula is formed by spiral cleavage and lacks a blastocoel 62 a characteristic of mammalian eggs that has made them difficult to study 63 in spiral cleavage, the blastomeres are packed in the most thermodynamically stable orientation, like ___ bubbles TOP |
1 type of meroblastic (incomplete) cleavage typical of eggs in which the yolk lies to one side (telolecithal eggs), as in birds 3 the b_ _stula is a hollow sphere of single cells produced by early cleavage, cell movements and changes in cell adhesion 4 signal for help 5 material in the egg _ _ _ _plasm will dictate the cleavage pattern that is important to the direction of shell coiling in snail eggs 6 three vowels 7 during membrane po_ _rization in mammalian cleavage, cell surface molecules rearrange to specific positions on cells 8 unlike almost all other animals, in mammals the genome is activated during ___ cleavage 12 hydrogen ion concentration, logrithmic scale 13 during cleavage in mammals, cleavage planes can ___ relative to each other 14 ci_ _a are motile structures that develop on the outer surface of blastula cells 15 the positi_ _n of a cell determines whether it will form trophoblast or embryonic structures 16 the inner cell _ _ _s is composed of cells that develop within the trophoblast during mammalian cleavage 17 series of mitotic divisions that divides the egg cytoplasm into numerous smaller, nucleated cells 19 the y_l_ lies toward one side in mesolecithal eggs 20 cell during the cleavage stage 23 an evolutionary adaptation that lets an embryo develop without an external food source 24 the _ _ophoblast will produce chorion and the embryonic part of the placenta, but no cells of the mammalian embryo 25 _lui_ is secreted by the trophoblast during blastocyst formation 27 process unique to mammalian cleavage; after the third cleavage, blastomeres become closely packed; exterior cells develop tight junctions while internal cells develop gap junctions 28 mi_ _ _meres are small blastomeres formed by unequal cleavages in the vegetal pole of sea urchins 31 in the equat_ _ _al cleavage pattern, the mitotic spindles of each blastomere are positioned parallel to the animal-vegetal axis 34 superfic_ _ _ cleavage is the type of meroblastic cleavage that is typical of eggs where the yolk lies centrally, as in insects 36 the b_ _ _tocoel in amphibians helps prevent cells from interacting prematurely 38 when intact, the ___ pellucida prevents implantation by preventing adhesion 39 _ _ _sminogen activator is an enzyme secreted by trophoblast during mammalian implantation that helps digest the extracellular matrix of the uterine wall 40 _ _ _ _lecithal eggs have little yolk 41 the ___ of cytoplasmic to nuclear volume decreases as cleavage progresses 42 was able to 43 junctions that allow communication between blastomeres during spiral cleavage 44 in the _ _ _ _ _lastic cleavage pattern, the cleavage furrow fails to penetrate the yolky cytoplasm 47 _ _ _ _meres are blastomeres of equal volume formed in the animal pole of sea urchins 49 a _u_ _ is an area partially or entirely enclosed by walls or buildings; common on college campuses 50 _ef_ is a synonym for sinistral, as in snail shell coiling 53 little of this is made until late in cleavage, anagram 58 greeting 59 strome_ _sin is an enzyme secreted by trophoblast during mammalian implantation that helps digest the extracellular matrix of the uterine wall 61 the trophoblast is an external layer of _ _ithelial cells connected by tight junctions that is formed during mammalian cleavage |
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