With one gene controlling a trait we have three possible genotypes, AA, Aa and aa and depending on the allelic interactions (dominance or incomplete dominance) we can have two or three phenotypes. As more and more genes control a trait, a greater number of genotypes are possible. The formula that predicts the number of genotypes from the number of genes is 3 to the power n. (n is the number of genes.) The following is the number of genotypes for a selected number (n) of genes which control an arbitrary trait.
Coal-Powered Electric Cars Out-Pollute Fossil Fuels. by. If the energy used to power electric vehicles comes from traditional resources such as burning coal rather than renewable sources, driving battery-powered cars will pollute the air more than cars powered by fossil fuels.
Electric cars recharged with power from natural-gas-fired stations were also a lot less lethal than petrol-driven ones, with 439 deaths. But if those same electric cars were recharged ultimately by coal, they would be responsible, according to the model, for just over 3,000 deaths.t was no surprise that electric cars whose batteries were topped up from wind, solar or hydroelectric sources came out cleanest, causing 231 putative deaths over the course of a year, compared with 878 for petrol cars.