Question

Ryan is looking at a cell under the microscope. He observes formation of spindle microtubules from the centrosomes. Which phase of the cell cycle is he observing?

Answer 1

Metaphase, in this Phase Chromosomes Lines Up at Equatorial area, which are held by those Spindles (Microtubules).

Answer 2

Answer:

Ryan is "looking" at a cell under the "microscope". He observes formation of "spindle microtubules" from the "centrosomes". The "phase of the cell cycle" is observing in the Metaphase. This is because it is in metaphase that the chromosomes are aligned in the equator for division.  

"Metaphase" is characterised by:

a) The attachment of the spindle fibres to the chromosomes’ kinetochores  

b) The alignment of chromosome along the metaphase plate in the equator.