Answer:
two types
During meiosis without crossing over, the alleles of two genes located on each chromosome migrate together and stay attached. We obtain, therefore, gametes that are 100% "parental", subdivided into two types of gametes from the point of view of allele separation.
Eyes and hands
there ya go bud :)
The cell membrane gateway system you are looking for is called <span>Sodium Potassium Pump.</span>