Ok, so I\'m studying about genetics and this slide explains calculating variance

Question

Ok, so I'm studying about genetics and this slide explains calculating variance within a populaition.

The colored numbers have been calculated from the numbers in their respective color's box.

I don't understand how the number was able to be made from those sets of numbers.

Can someone explain it for me?

Genetic and Phenotypic Variance Table 19-2 Simulated Data for Days to Pollen Shed for 10 Inbred Lines of Maize Grown in Two Experiments Inbred lines 68 70 72 74 Environment 2 Environment 3 70 70 72 72 76 68 74 14.67E 12.0+ 2.67 Broad-sense heritability, H2- Vg / Vx

Explanation / Answer

To calculate Ve follow these steps:

subtract total mean of three experiments from mean of individual experiments

68 - 70 = - 2

70 - 70 = 0

72 - 70 = 2

Now square the result, add and divide by number of experiments to get Ve

(2)2 + (0)2 + (2)2 / 3 = 2.67

Similarly do for Vg

= (64 - 70)2 + (66 - 70)2 + (68 - 70)2 + (68 - 70)2 + (70 - 70)2 + (70 - 70)2 + (72 - 70)2 + (72 - 70)2 + (74 - 76)2 + (76 - 70)2 / 10

= 120 / 10

= 12

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