In cattle, the allele for no horns (P) is dominant to the allele for horns (p). The allele for cloven hooves (C) is dominant to the allele for mule feet (c). Cattle that are heterozygous for these traits are crossed. The Punnett square for this cross is shown below.

B. He was the first to observe live cells in a sample of pond water.

Explanation:

He was a self taught man that created the first microscopes which allowed him and others to see tiny organisms.

The other answers are not correct as Hans made the first microscope, cells existing in liquids were not a critical part of micro biology, and it was Schlieden and Schwann who created the cell theory that stated that all living things were made of cells.