A white ewe is mated to a white ram and produced a black lamb. How did these happened? ( Punnett Square, monohybrid )
This happened due to the black recessive gene that was present in either the white ewe or the white ram. The color spectrum either in the white ram or ewe also influenced the production of a black lamb.
Somewhere in the genetic pool of either the ewe or the ram (or both) there was a recessive gene for black wool, which the lamb received as a dominate gene
"What have ewe been up to?!?" - Ram.