What purpose did plating the yeast serve in this experiment? What purpose did the water serve?

yeast plating - demonstrate the procedure for yeast streaking.

water - for promoting growth as required for anaerobic respiration process.

Explanation:

Plating of yeasts can play a major role and fulfill various purposes:

1) It helps in demonstrating that yeast can grow in petri dishes.

2) It also help in explain how the proper protocol for yeast streaking.

The lanting of yeast is used to show the procedure or protocol for yeast streaking. The importance of the water is to promoting the growth of the yeast as water is required for anaerobic respiration process.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.