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posted by bill .
In humans, the ABO blood type is under the control of autosomal multiple alleles. Redgreen color blindness is a recessive Xlinked trait. If two parents who are both type A and have normal vision produce a son who is colorblind and type O, what is the probability that their next child will be a female who has normal vision and is type O?
Hi can someone please help me. Thank you

If they both have A type blood with an O son, their genotypes for blood are both AO. The probability of getting an O child is 25%. Check with a Punnett square.
If the parent both have normal vision, the mother must be a carrier for the colorblindness. The probability of getting a normal vision female is also 25%. Must get normal X from both mom and pop.
The probability of 2 or more events occurring is obtained by multiplying the probability of the separate events. You can do this.
I hope this helps. Thanks for asking.