In humans, the ABO blood type is under the control of autosomal m...

Question

In humans, the ABO blood type is under the control of autosomal multiple alleles. Color blindness is a recessive X-linked trait. If two parents who are both type A and have normal vision produce a son who is color-blind and is type O, what is the probability that their next child will be a female who has normal vision and is type O?

Accepted Answer

Hey, everyone, let's take a look at this question together, which of the falling hereditary diseases is not passed on from father to son. And so in the case of passing on genes from parent to offspring, we know that we have the mom, we have the dad and we have a son and daughter. And we know that the mom provides both the son and the daughter with that X chromosome and that the dad provides the sun with the Y and the daughter with the other X. And so since the father passes on the Y chromosome to the sun and the sun gets the X from the mother, anything related to the dad's X chromosome is not passed on to the sun. And so since an autism, a genetic disease can be passed on in that Y chromosome, answer choice A is not the right answer. Answer choice B is red green color blindness, which we know that color blindness is actually an X linked disorder, which we know the father does not pass on that X chromosome to the sun and in fact passes it on to the daughter. Which means that answer choice B cannot be passed on from father to son because it is an excellent disorder. But answer choice C. Says excellent disorder. So that would mean that answer choices B and C are correct. So answer choice D is the correct answer to this question because autism and genetic diseases can be passed on from father to son through the Y chromosome. However red green color blindness is an excellent disorder and the son does not inherit that X chromosome from the father, and so the father cannot pass on any hereditary disease that is linked to that X chromosome from the father to the son. So answer choice D. Is the correct answer. I hope you find this video to be helpful. Thank you and goodbye.

Key Concepts

ABO Blood Type Genetics

X-linked Inheritance

Punnett Squares and Probability

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