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| A long, thickened region in the blastoderm through which cells ingress during gastrulation in birds and mammals. |
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| In mammals, a thickening at the anterior end of the primitive streak that serves as the functional equivalent of the dorsal lip of the amphibian blastopore. |
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| In mammals, cleavage pattern in which second cleavages are perpendicular, meridional in one blastomere and equatorial in the other. |
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| Phenomenon in mammalian embryos in which blastomeres become tightly packed to form a compact morula. |
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| In mammalian embryos, creation of a blastocoel by secretion of fluid by the outermost cells of the morula into the interior region. |
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| In mammalian embryos, embryonic stage characterized by the inner cell mass being positioned on one side of a ring of trophoblast cells. |
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| Outermost cells of a mammalian blastocyst that contribute to the chorion of the placenta. |
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| The small group of cells within a mammalian blastocyst that will give rise to the embryo proper and extraembryonic membranes. |
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| Related genes that exist within a species or in different species that are descended from the same gene in a common ancestor. |
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Definition
| Related genes in different species that are descended from the same gene in a common ancestor. |
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Definition
| Related genes that are derived from gene duplication within a single genome. |
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