Question

if two parents are heterozygous for type a blood, what is the probability that their offspring would have type o blood? 75% 100 % 25% 50%

Explanation:

Step1: Recall Blood Type Genetics

Heterozygous type A blood means genotype \( I^A i \) (since \( I^A \) is dominant for A, \( i \) is recessive for O). Each parent has genotype \( I^A i \).

Step2: Create Punnett Square

	\( I^A \)	\( i \)
\( i \)	\( I^A i \)	\( i i \)

Step3: Determine Genotypes and Probability

• \( I^A I^A \): Type A (1/4)
• \( I^A i \): Type A (2/4)
• \( i i \): Type O (1/4 = 25%)

Answer:

25% (Option: 25%)