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After several generations the amount of heterosis retained will stabilize at 66.67 % for both individual and maternal heterosis . The amount of heterosis that can be used can be calculated by considering the proportion of the gene pairs of an individual which are crossbred . It might force them to check their own facts ; unless , of course , they were ditto-heads in which case no amount of facts could change the way they thought . One advantage is the circumvention of server solutions that often present single points of failure or hold large amounts of configuration information . The amount of ozone ‐ depleting chemicals in the atmosphere would have been five times greater . The temperature near the height of the ozone maximum ( about 17 km ) is strongly linked with the total amount of ozone in the in the atmosphere , and this gives us additional information on the state of the ozone layer . The only change from the previous example is that an additional term is added to account for the amount of heterosis that is utilized . The amount of ozone in the atmosphere is measured in milli-atmo-centimetres ( Dobson Units , DU ) and a typical measurement is about 300 DU . A certain amount of ozone data are publicly available , in the form of graphs and bulletins .