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Hello! I need help with this exercise question. I am not really sure which pedigree diagram is autosomal and which is not. But, is question b 1/2. Can someone give an explanation? Thanks very much in advance? Appreciate any help!!

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marked as duplicate by biogirl, Chris, WYSIWYG, Satwik Pasani, Atl LED Jan 28 at 2:58

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According to the key given, the one shaded black on the right is autosomal and one on the left is sex linked.

Yes, the answer to b is half because Maria is XhX ans Peter is XY and so the probability of the child having this disease is 1/2.

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@ApothemCyte Does this make sense ? Ask, if u need help ! –  biogirl Jan 26 at 18:33
    
Thanks for the reply! But if the the diagram on the right is concerned with an autosomal disease, shouldn't we use Gg/gg/GG notation in place of XhX (for Maria). –  ApothemCyte Jan 26 at 19:49
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Also, I'm a little bit unsure as to whether the genotypes I have for the diagram are actually correct. So, a brief explanation would help. Thanks in advance! –  ApothemCyte Jan 26 at 19:51
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ApothemCyte, the diagrams are concerned with both the autosomal disease and the X-linked disease; look at whether the person symbol is shaded on the left side or the right side. –  mgkrebbs Jan 26 at 21:18
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@mgkrebbs So here is my 2nd attempt. Do they look right now? (even to a person with no formal training) link: s837.photobucket.com/user/apothemnew/media/… –  ApothemCyte Jan 27 at 2:01
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