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TLS Online TPP Program

#Id: 2009

Reciprocal crosses pair of crosses in which the phenotypes of the male and female parents are reversed.

#Unit 8. Inheritance Biology #Dominance, Segregation #Part B Pointers
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TLS Online TPP Program

#Id: 190

#Unit 5. Developmental Biology

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TLS Online TPP Program

#Id: 191

#Unit 5. Developmental Biology

At slightly lower concentrations (intermediate concentrations), activin (about 100 molecules per cell) activated the Xbra gene and instructed the cell to become muscle.
TLS Online TPP Program

#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.
TLS Online TPP Program

#Id: 930

#Unit 5. Developmental Biology

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

#Id: 931

#Unit 5. Developmental Biology

Stem cell potential refers to the range of cell types a stem cell can produce. 
TLS Online TPP Program

#Id: 932

#Unit 5. Developmental Biology

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