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Rocks of the Ediacaran System (635–541 Ma) preserve fossil evidence of some of the earliest complex macroscopic organisms, many of which have been interpreted as animals. However, the unusual morpho...

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Figure 1

Life cycle of a fern (genus Polypodium). The sporophyte generation is photosynthetic and is independent of the gametophyte. The sporangia are protected by a layer of cells called the indusium. This entire structure is called a sorus. Meiosis within the sporangia yields a haploid spore. Each spore divides mitotically to produce a heart-shaped gametophyte, which differentiates both archegonia and antheridia on one individual. The gametophyte is photosynthetic and independent, although it is smaller than the sporophyte. Fertilization takes place when water is available for sperm to swim to the archegonia and fertilize the eggs. The sporophyte has vascular tissue and roots; the gametophyte does not.

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Plant Developmental Biology - Biotechnological Perspectives PDF By:Eng Chong Pua,Michael R. Davey Published on 2010-03-17 by Springer Scienc...

This priapulid, or "penis worm", is shaking up how biologists think about some of the fundamental divisions between organisms. Read more: http://www.nature.c...

Developmental history of a frog. The stages from fertilization through hatching (birth) are known collectively as embryogenesis. The region set aside for producing germ cells is shown in bright purple. Gametogenesis, which is completed in the sexually mature adult, begins at different times during development, depending on the species. (The sizes of the varicolored wedges shown here are arbitrary and do not correspond to the proportion of the life cycle spent in each stage.)

Pubrica Academy explains the Advanced experimental designs in stem cell and developmental biology for disease treatment and tissue regeneration

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[IMG] In Developmental Biology of the Sea Urchin and Other Marine Invertebrates: Methods and Protocols, expert researchers in the field detail many of...

Stereogram of a 24-hour chick embryo. Cephalic portions are finishing neurulation while the caudal portions are still undergoing gastrulation. (From Patten 1971; after Huettner 1949.)

Generalized model of Drosophila anterior-posterior pattern formation. (A) The pattern is established by maternal effect genes that form gradients and regions of morphogenetic proteins. These morphogenetic determinants create a gradient of Hunchback protein that differentially activates the gap genes, which define broad territories of the embryo. The gap genes enable the expression of the pair-rule genes, each of which divides the embryo into regions about two segments wide. The segment polarity genes then divide the embryo into segment-sized units along the anterior-posterior axis. Together, the actions of these genes define the spatial domains of the homeotic genes that define the identities of each of the segments. In this way, periodicity is generated from nonperiodicity, and each segment is given a unique identity. (B) Maternal effect genes. The anterior axis is specified by the gradient of Bicoid protein (yellow through red). (C) Gap gene protein expression and overlap. The domain of Hunchback protein (orange) and the domain of Krüppel protein (green) overlap to form a region containing both transcription factors (yellow). (D) Products of the fushi tarazu pair-rule gene form seven bands across the embryo. (E) Products of the segment polarity gene engrailed, seen here at the extended germ band stage. (B courtesy of C. Nüsslein-Vollhard; C courtesy of C. Rushlow and M. Levine; D courtesy of T. Karr; E courtesy of S. Carroll and S. Paddock.)

The Department of Developmental and Regenerative Biology at the Icahn School of Medicine at Mount Sinai explores the development, patterning, and regeneration of cells and organs.

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[IMG] A collection of classic, novel, and state-of-the-art methods for the study of cell migration in cultured cells, different model organisms, and...

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