**blush**
At first I was going to say "why not," then I looked it over. I do agree that you can't have some, but not all of the sex-linked genes in the same bird
		
	  I am going to hope that I missed something in the text that mentioned that--I was just looking for an example of a punnett square with two genes to show the geometric progression.
	
		
			
		
		
	
				
			At first I was going to say "why not," then I looked it over. I do agree that you can't have some, but not all of the sex-linked genes in the same bird
	
	
	
	
	
	