Electron affinity: The enthalpy change that results from adding an electron to a gaseous atom.

Electron affinity is becoming less negative (less exothermic) and less likely to gain an electron. 

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#Id: 1042

#Unit 5. Developmental Biology

Limb field - All the cells are capable of forming a limb on their own.

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#Id: 1043

#Unit 5. Developmental Biology

The positional information needed to construct a limb has to function in a three-dimensional coordinate system:

Proximal-distal axis

Anterior-posterior axis

Dorsal-ventral axis

TLS Online TPP Program

#Id: 1044

#Unit 5. Developmental Biology

The limb bud is regionalized into 3 functional domains

1. Progress zone

2. Zone of polarizing activity

3. Apical ectodermal ridge

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#Id: 1045

#Unit 5. Developmental Biology

The highly proliferative mesenchyme that fuels limb bud growth is known as the progress zone mesenchyme

TLS Online TPP Program

#Id: 1046

#Unit 5. Developmental Biology

Fgf10 is the major active factor in the PZ.

TLS Online TPP Program

#Id: 1047

#Unit 5. Developmental Biology

The cells found within the most posterior region of the progress zone constitute the zone of polarizing activity.