You either do not have a Javascript capable browser, or have Javascript turned off. Please either upgrade to Netscape 4, Internet Explorer 4 or higher, or turn Javascript back on if you already have one of these.

Let E designate a dominant allele in horses producing a black coat color and e represent the recessive, such that ee is chestnut. Also, let T represent the dominant allele for Tobiano spotting and t represent the recessive allele for solid coat color, such that tt is solid color.

The genotypic and phenotypic relationships are:

E_T_	Black and spotted
E_tt	Solid black
eeT_	Chestnut and spotted
eett	Solid chestnut

Fill in the expected ratios of progeny phenotypes for each mating. Once you have filled in all the ratios for a mating, press the "Check" button to check your answers. If a phenotype is not possible for a particular mating put a zero in the box corresponding to that phenotype.