It is always hard to say what the "initial" cause is- the initial cause
is always caused by something else. I'd say in this case that the
initial cause was the positioning of Soviet nuclean weapons on Cuba,
which was a very tangeable threat to the US. The noticing of these
weapons by the US marked the start of the Crisis. 
But you should
also see the positioning of the weapons on Cuba in a wider context of
the Cold war. Specifically, Cuba felt threatened due to the Bay of Pigs
Invasion in  1961 ( a year earlier) and this caused Cuba to invite
Soviet weapons as a protection. 
        
                    
             
        
        
        
Judicial branch can check both legislative and executive branch by declaring laws as unconstitutional. For example, when Trump did the travel ban a federal judge was able to overturn it. 
        
                    
             
        
        
        
He united the country under Moscow and became the 1st monarch of Russia by joining all the small Russian principalities together.
        
             
        
        
        
Answer:
One in four offspring (1/4)
Explanation:
A pink flower is heterozygous, let's assume As.
Thus crossing two heterozygous, the result will be;
Aa x Aa
AA, Aa, Aa, aa. 
The phenotypic result will be , one red petal, two pink petal and one white petal