Some genes, such as the human ABO blood groups, have more than two alleles. For these genes:
a. a greater proportion of the individuals must be heterozygous than homozygous.
b. some individuals can be triply heterozygous.
c. normal dominance relationships are not possible.
d. individuals can only possess two alleles.
e. All of the above are correct
Ans: d. individuals can only possess two alleles.
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