Pedigree Question

[pnoybballin]

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Hey everyone I have attached a pedigree and I was wondering if someone could please explain why this pedigree wouldn't be autosomal recessive or X-linked recessive and why it is autosomal dominant. I understand why it wouldn't be X-linked dominant since the father who is affected can only give his son a Y chromosome but the son is a carrier so that rules it out. Thanks a lot everyone.

In the pedigree outlined below, the MOST probable mode of inheritance is:

A. autosomal dominant.
B. X-linked dominant.
C. autosomal recessive.
D. X-linked recessive.

The answer is A.

 

[ChemEngSoonMD]

Dominant because it took only one parent to make you ******ed.
Autosomal because in the picture a guy got it from his dad (gen II from gen I). A guy can only get Y from his dad. So obviously, it can't be X linked since you can only X from your mother if you are a dude.

A is easy to spot because it tends to be present in every generation and it tends to occur equally between men and women.