Sentence:  Gray and blue-<WSD>eyed</WSD> parents will tend to have either gray-<WSD>eyed</WSD> children only or an equal number of gray- and of blue-<WSD>eyed</WSD> children according as the gray-<WSD>eyed</WSD> parent is homozygous or heterozygous. 
Meaning of the word marked with <WSD> tags:  Having the specified kind or number of eyes.