Draw all possible conclusions concerning the mode of inheritance of the trait portrayed in the following limited pedigree.

Question

Pedigree chart showing two generations with one affected female indicated by a filled circle among unaffected family members.

Accepted Answer

Hey everyone, let's take a look at this question together in the following pedigree, identify the mode of inheritance. Let's take a look at the pedigree down below and try to figure out what the motive inheritance is. The best way to figure this out, is to take a look at this graphic that we have and ask ourselves all these different questions to try to figure out what the motive inheritance is starting off to. All affected individuals have an affected parent, what we can see here, here and here are all the affected individuals as well as here and here. And we can see that for these, right here, we have this affected parent. And then for these two, we have this affected parent. The answer to that question is yes, all affected individuals have an affected parent. Then the next question says, do all the affected males have an affected mother, you can see right here is our single affected mail and we can see that right here, we do have an affected mother, which means that the answer to that question is also yes. And so the next question says, does an affected father produced daughters who are all affected. And so we can see here is our affected father. And then we can see that we do have one, two and three daughters who are all affected? So the answer to that one is also yes. And our last question says, does an affected father produce sons who are all not affected. Does this affected father have any sons who are all not affected? Well, we can see here and here are the two sons of that affected father, both of which are now affected. So the answer to that one is also yes. Which means that the correct answer. What the motive inheritances is X linked dominant? Making answer choice C. The correct answer. Because looking at the graphic, we can see that all affected individuals do have that affected parent. All the affected males do have that affected mother and then the affected father produces daughters who are also all affected and that all sons are not affected, thus making the correct mode of inheritance X linked dominant. So answer choice C. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Draw all possible conclusions concerning the mode of inheritance of the trait portrayed in the following limited pedigree.

Verified video answer for a similar problem:

Key Concepts

Pedigree Analysis

Modes of Inheritance

Sex-Linked vs. Autosomal Traits