rdfs:comment
| - Valve games typically contain stories that are expressed through exploring the world and interacting with its inhabitants rather than from watching cut-scenes or reading explanations out of the game manuals. This seems to be the case in Left 4 Dead as well. Graffiti covers many walls of the game, often containing messages to separated loved ones, foreboding messages of warning, and, most interestingly, past Survivors' own explanations for the Infection, varying from government conspiracy to an alien plot to an act of God.
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abstract
| - Valve games typically contain stories that are expressed through exploring the world and interacting with its inhabitants rather than from watching cut-scenes or reading explanations out of the game manuals. This seems to be the case in Left 4 Dead as well. Graffiti covers many walls of the game, often containing messages to separated loved ones, foreboding messages of warning, and, most interestingly, past Survivors' own explanations for the Infection, varying from government conspiracy to an alien plot to an act of God. In The Sacrifice, it is explained that the immunity is passed down through the father's genes. The most common theory to explain this is that the gene that makes people "resistant" is a recessive allele on the X chromosome. In Zoey's case, as well as Rochelle's and any other female Survivors', she must have gotten an X chromosome with the recessive gene from both her mother and her father. Zoey's mother was not resistant, meaning that she only had one X chromosome with the gene (the dominant gene on her other X chromosome would have overridden the recessive one). As explained, her father was resistant, making his death an avoidable tragedy. This would also explain why there are more male than female Survivors, as a male Survivor would only need one copy of the "resistant" gene found on his X chromosome (his Y chromosome would neither have nor need this), while any female would need two copies―one on each X chromosome. In fact, the number of immune males would be the square of the number of immune females, as per basic Punnett squares. If the sex-makeup of the two Survivor groups is representative, then we would expect one in three males, and one in nine females in the pre-outbreak population to be immune to the Infection―a net 22% (approx. 1.54 billion) of the population (this is only true if the immune gene occurs as much as the dominant gene without immunity. It appears that the majority of the population do not have immunity, so it can be assumed that this gene is also a rare mutation that most people do not have).
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