Which type of chromosome rearrangement results in half of all meioses producing no viable gametes and the other half producing four viable gametes

we would need to see the picture to answer it

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.

it is a. i hope this .