1. The following diagrams show 4 disease pedigrees. State the mode of inheritanc
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Question
1. The following diagrams show 4 disease pedigrees. State the mode of inheritance depicted by each dominant or recessive; and autosomal or sex-linked and explain why you decided as you did.
-Square represent males; circles represent females
-Shaded squares/circles represent individual showing symptoms of the disease; unshaded squares/circles represent individuals normal for that trait.
-Horizontal lines denote indivuduals in the same generation, vertical lines indicate descent
-Roman numberals designate the generation; ordinary numbers, the individuals within each generation.
Explanation / Answer
A) dominating. because half of the ofspring do posess desease /trait(darkened spots). same goes onward. about half of the F I & II &III generations ofspring posesses the trait. Autosomal, not sex linked because both sexes posess it B) resessive, cannot say if sex linked ( because only 1 posess the trait). C) dominating , autosomal. (both sexes poses trait). dominating because either parent must posess the trait for the trait to pass on to ofspring. also about half of the ofspring posess the trait, if either parent does. D) resessive, POSSIBLE sex linked ( because you cant really say for shure without testing, the grid gives only a possibility. but if both sexes posess it , then it sertainly is NOT sex linked). resessive because only small part of offpsring posess the trait, and so that parents do not have to posess it.
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