So there's a simple explanation for the Great Oxidation Event. It was the cyanobacteria, pumping out unwanted oxygen, that transformed Earth's atmosphere. ... That means the cyanobacteria were busy pumping out oxygen for at least half a billion years before oxygen started appearing in the air.
The genotype would be X'Y for the father (he would be colorblind) The genotype would be X'X for the mother (she would be a carrier) The offspring would be X'X' _ X'X_ X'Y_ XY The ratio would be 1:1 normal to colorblind Hope this was helpful(;
Explanation: the reason is that O type blood can donate to type A, B, AB and O is Compatible to other type of blood - but Kidney transplants need the same type of blood.
