CDC conducts studies each year to determine how well the flu vaccine protects against flu illness. <span>While vaccine effectiveness can vary,</span> recent studies show vaccine reduces the risk of flu illness by about 50% to 60% among the overall population during seasons when most circulating flu viruses are like the vaccine viruses.
Assuming type a would be an AA allele and type b is a BB allele, No because an AA mother with an AB father wont make a BB child.
I would go with all of the above
