Which of the following is true about cells?
cells have specialized components that perform different, specific functions.

cells have specialized components that all perform the same functions.

a cell's components are all identical and perform the same function.

a cell has a single component that performs all of the cell's different, specific functions.

You would draw a four by four punnett square. On top, your genotypes are the father's.  Across: BL bL BL bL Down: BL Bl BL Bl 

Genotypes                                                   Phenotypes

BBLl:25%                                                    Black Spot Long Tail: 100%

BBLL: 25%                                                 Black Spot Short Tail: 0%

BbLl: 25%                                                   Brown Spot Long Tail: 0%

BbLL: 25%                                                 Brown Spot Short Tail: 0%

BBll: 0% 

bbLL: 0%

bbLl: 0%

bbll: 0%

Possibility of Genotypes: 25% BBLL, 25% BbLL, 25% BBLl, 25% BbLl  

Possibility of Phenotypes: 100% black spotted long tailed dog.

Hope this helps!