<p>Hello everyone, </p>
<p>So am studying for my next Biology E/M SAT II exam, and I'm having trouble understanding how I can determine whether a pedigree is showing a sex-linked or an autosomal disease?</p>
<p>Can anyone please explain this little thing to me? I'll be thankful !</p>
<p>Hey! I’m taking this test too (in January). If it’s sex-linked, a lot more guys will have it than girls.</p>
<p>If it’s sex linked, the son of a mother with the disease will always have the disease. The daughter of a father without the disease cannot have the disease (though she can be a carrier). </p>
<p>Afflicted mothers have afflicted sons, negative fathers have negative daughters.</p>
<p>If everything else fails, just do trial and error; try it with both autosomal and sex-linked, and see which one can’t work. Or just do what betc said; more males get the sex linked diseases.</p>