Is the ratio of observed phenotypes the same as the ratio of predicted phenotypes? Why or why not?

Monohybrid crosses are between two True breeding parents showing different versions of the same gene. In the example below H represents straight hair and h represents wavy hair.

How genes get passed on

F2 Generation = HH (Straight hair), Hh (Straight hair), Hh (straight hair) and hh (wavy hair)

F2 genotype ratio = 1 HH : 2 Hh: 1hh

F2 phenotype ratio = 3 Wavy hair : 1 Straight hair

The difference between predicted and observed results:

The actual numbers of offspring produced of each type is unlikely to be exactly the same as expected or predicted. The reasons for this difference are:

-fertilisation is a random process

-the sample was not big enough

The phenotype for a characteristic like eye color is the result of the combination of alleles. If the alleles in the parental genotype are dominant or recessive, probable outcomes can be predicted and observation can be done easily. A monohybrid cross is a genetics cross that shows the inheritance of one characteristic and according to this process the phenotype observation can be made as there is no difference between predicted phenotype and observed phenotype, they are likely same.