The decrease of testosterone in males is called andropause. This happens when a man reaches the age of 40 where there is a gradual decrease in their testosterone; about one percent less each year. Symptoms of andropause include, depression, insomnia, increased body fat, and difficulty concentrating.
        
             
        
        
        
The slowing down of the ray of light also causes the light to change direction
        
             
        
        
        
The  cross  of  heterozygous  
AaBb as  parental  phenotype led   to  formation  of  1
6  phenotype   of  the  offspring.This  is  because  this  is  dihybrid   form  of inheritance .The   probability  of  having  
aabb   offspring  is  
1/16  since   there  is  only  one  aabb  type  of  offspring  phenotype  out  of 
 the
  16.  An  illustration  of  how  crossing  is  done  is  as  per  punnet square  below