Incomplete lineage sorting (hemiplasy)

If you make a phylogenetic tree of how the alleles are related to each other, it does not mirror how the species split apart.

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#Unit 4. Cell Communication and Cell Signaling

Myosins have 

  Motor head domain

  Lever-arm neck domain

  Cargo-binding tail domain

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#Unit 4. Cell Communication and Cell Signaling

The first myosin discovered

Myosin II, was isolated from skeletal muscle.

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#Unit 4. Cell Communication and Cell Signaling

Three classes of myosins:

Myosin I

Myosin II

Myosin V

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#Unit 4. Cell Communication and Cell Signaling

Myosin I

single head domain

Function- Membrane association, endocytosis

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#Unit 4. Cell Communication and Cell Signaling

Myosin II

Two heads and assembles into bipolar filaments

Small and non-processive

Function- Contraction 

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#Unit 4. Cell Communication and Cell Signaling

Myosin V

Two heads but does not assemble into filaments

Large and processive

Function- Organelle transport