Monohybrid Crosses in Maize Cobs

Phenotypic Ratio =1 Colourless Fruit: 3 Coloured Fruits

Genotypic Ratio = 1 Homozygous Dominant: 2 Heterozygous: 1 Homozygous Recessive

Comparison between Theoretical Result  and Expected Result

According to my results, the ratio of colorless kernels to colored kernels is 1:2.5 or in other words for every 2 colourless kernels, there are 5 coloured kernels. However the expected phenotypic ratio is 1 colourless corn kernel: 3 coloured corn kernels.  The ratio obtained from my results and the expected ratio do not closely match because as the number of colorless corn kernels increases in both ratios, the difference between the number of colored corn kernels gets bigger and bigger. So for example if the number of colourless corn kernels was 50, the number of coloured corn kernels would be 125 and 150, and if the number of colourless corn kernels was 100, the number of coloured corn kernels would be 250 and 300. As you can see the difference increases by 25 by each time.

Average                                                                                                                                                                      Formula:

Figure 1.1 Calculation for the Average Number of Colored Corn Kernels

Standard Deviation

Formula:

Figure 1.3 Standard Deviation Calculations for Colourless Corn Kernels