Why are observed ratios often different to expected ratios in genetics?

The expected ratio is based on each probability occurring. However, this is not the case realistically. For example, if a trait has a 25% chance of being passed on, this does not mean that one in four offspring will have that trait. It means that there is a 25% chance for EACH of the offspring to have that trait. This causes the observed and expected ratios to differ.

Lysosomes contain digestive enzymes (lysozyme) and in digestion of different biomolecules like proteins, fats, starch, etc.cleans the cell by destroying damaged organellesprotects cells from certain virus/bacteria by killing them