Pleiotropism single gene controls more than one phenotypic effect

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#Id: 192

#Unit 5. Developmental Biology

At lower concentrations of activin, genes were not activated, and the “default” gene expression instructed the cells to become blood vessels and heart.

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#Id: 930

#Unit 5. Developmental Biology

Stem cells are sometimes referred to as “undifferentiated” due to this maintenance of proliferative properties.

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#Id: 931

#Unit 5. Developmental Biology

Stem cell potential refers to the range of cell types a stem cell can produce. 

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#Id: 932

#Unit 5. Developmental Biology

A totipotent stem cell can generate all cell types of both embryonic and extraembryonic lineages. 

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#Id: 933

#Unit 5. Developmental Biology

The niche employs a variety of mechanisms of cell-to-cell communication to regulate the quiescent, proliferative, and differentiative states of the resident stem cell.

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#Id: 934

#Unit 5. Developmental Biology

The shoot apical and root apical meristems provide a continuous source of totipotent stem cells for a plant to generate a majority of its aerial and ground tissues throughout life.