If two parents are heterozygous for type A blood, what is the p probability that the offspring would have type O blood? 75% 25% 100% 50%

To determine the probability of an offspring having type O blood when both parents are heterozygous for type A blood, we can use a Punnett square. <br /><br />Let's represent the alleles for blood type as follows:<br />- A (dominant allele for type A blood)<br />- O (recessive allele for type O blood)<br /><br />Since both parents are heterozygous for type A blood, their genotypes are AO.<br /><br />We can set up a Punnett square to find the possible genotypes of their offspring:<br /><br />```<br /> A O<br /> ----------------<br />A | AA | AO |<br /> ----------------<br />O | AO | OO |<br />```<br /><br />From the Punnett square, we can see that there is only one combination out of four that results in type O blood (OO). Therefore, the probability of an offspring having type O blood is 1 out of 4, or 25%.<br /><br />So, the correct answer is $25\%$.