30%AA自交后基因型还是AA30%,20%aa自交后还是aa20%,50%Aa自交后得12.5%AA,25%Aa,12.5%aa,自交后AA个体占30%+12.5%=42.5%;aa个体占20%+12.5%=32.5%.
每个基因型包括两个基因,A的频率=(30%*2+12.5%*2+25%*1)/200% =55%
30%AA自交后基因型还是AA30%,20%aa自交后还是aa20%,50%Aa自交后得12.5%AA,25%Aa,12.5%aa,自交后AA个体占30%+12.5%=42.5%;aa个体占20%+12.5%=32.5%.
每个基因型包括两个基因,A的频率=(30%*2+12.5%*2+25%*1)/200% =55%