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15 Cards in this Set
- Front
- Back
Cytoplasmic determinants
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fixes developmental fate of zygote
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Gray crescent
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rearrangement of cytoplasm of egg after fertilization; initiated by centriole of sperm; marks location of important developmental events
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Fate of three cell layers after gastrulation
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Ectoderm will become epidermal skin, Mesoderm will form muscles, bone, kidneys, and Endoderm will form lining of gut, liver and lungs
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Young Frog embryo
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Has polarity; vegatal pole: with yolk, Animal pole: Little yolk will become anterior end
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Organogenesis (frog)
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After gastrulation, three germ layers; notocord forms from condensation of dorsal mesoderm cells; Neurulation is initiation of nervous system
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Neurulation (frog)
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dorsal neural plate invaginates and folds forming a tube (precuror to brain and spinal cord; notocord is rod of mesoderm cells ventral to tube becomes vertebrae; Neural crest cells above tube form skull bones and teeth
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Somites (chicken embryo)
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blocks of mesodermal cells that give rise to vertebrae and muscles
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Chicken Embryo
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Four membranes: Yolk sac, allantoic membrane, amnion, chorion
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Yolk sac (chicken embyro)
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membrane that encloses yolks within the egg and passes nutrients to embryo
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Allantoic membrane (chicken embryo)
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A sac for waste storage
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Amnion
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membrane that secretes fluid for protection; filled with amniotic fluid
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Chorion (chicken embryo)
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membrane that reduce water loss and exchanges gases
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Placenta
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an organ that exchanges nutrients, repiratory gases, and metabolic wastes between mother and embryo; forms from chorion and uterine wall
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Oviparous
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egg laying type of child birth
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Viviparous
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live bearing child birth
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