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Definition
| The 2n cell that results from the union of n gametes in sexual reproduction. |
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| An early embryo consisting of a solid ball of cells. |
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| In animal development, a hollow ball of cells produced by cleavage of a fertilized ovum. In mammilian development, known as a blastocyte. |
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| A 3 layered embryo formed by the process of gastrulation. |
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| A young organism before it emerges from the egg, seed, or body of its mother. |
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| The unborn human offspring from the 3rd month of pregnancy to birth. |
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| Series of mitotic cell division, without growth, that converts the zygote to a multicellular blastula. |
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Definition
| the division of the cell nucleus resulting in two daughter nuclei, each with the same number of chromosomes as the parent nucleus. |
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Definition
| process in which the 2n cell undergoes two successive nuclear divisions (meiosis I & II), potentially producing four n nuclei; leads to formation of gametes in animals and spores in plants. |
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Definition
| the fusion of two n gametes; results in the formation of a 2n zygote |
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Definition
| The production and development of the organs of an animal or palnt. |
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Definition
| process in embryonic development during which the three germ layers (ectoderm, mesoderm, endoderm) form. |
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| the stage of organogenesis in vertebrate embryos, during which the neural tube is transformed into primitive structures that will later develop into the CNS. |
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| a group of cells, formed during animal embryogenesis. (endoderm, mesoderm, ectoderm) |
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| List the three germ layers from outermost to innermost found in the embryo. |
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Definition
Ectoderm - outer layer
Mesoderm - middle skin
Endoderm - inner skin |
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| Name the structures that form from each of the germ layers during embryonic development. |
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Definition
Ectoderm - Skin cells, neuron of brain, pigment cell
Mesoderm - cardiac muscle, skeletal muscle cells, tubule cell of kidney, red blood cells, smooth muscle (in gut)
Endoderm - Lung Cell, pancreatic cell, thyroid cell, digestive tube |
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| Define pluripotent stem cells. |
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Definition
| can differentiate into embryonic cell types. Can contstruct complete, viable orangism. Produced from fusion of one egg and sperm cells. |
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| Define totipotent stem cells. |
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Definition
| the descendants of totipotent cells and can differentiate into nearly all cells. |
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| What developmental stages are seen in totipotent cells? |
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Definition
| the earliest stage of embryonic development |
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| What developmental stages are seen in pluripotent cells? |
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Definition
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| Where are stem cells found in adults? |
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Definition
| bone marrow, adipose tissue, blood |
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