Anyone?

I read about this each year.

I keep getting the impression that scientists are stumped.

The centrioles in germ cells give rise to the flagellum in sperm during spermiogenesis

In some cells, cilia can grow from centrioles which play an important part in cell signalling (e.g. platelet derived growth factor).

Aren't they what create the spindles that seperate a cell during cell-devision?

 

They create spindles that brace against the cell-wall, and then create axial spindles and increase their length to push both ends of the cell away from each other during anophase; then, an actin band around the cell pinches down to split the cell in two.

 

\          .         /
\         .        /
--L================L--
/         .        \
/          .         \

^bracing spindles against the
cell-wall

= is axial spindle, elongating it pushes opposite
ends of the cell away from each other

dots are where the actin band would go

 

google cytokinetics for more, i suppose.