Question

Please help me with this problem. i am so confused. I will post a picture. Can u please explain it too?

Answer 1

So you are having a problem with the last question?

Answer 2

I am having difficulties understanding what to do with everything along with other problems. But if I can understand this one then I can do the others.

Answer 3

Hmm I see, I can't help you at the moment with all of it, so I'll leave it to someone else. Lilia? :)

Answer 4

(Thanks! Sorry to dump that on you!)

Answer 5

I'm sorry the other users couldn't get to your question.

When you're looking at a pedigree, the squares are men and the circles are women. It tells you that, in this case, the trait is not sex linked so that it is really not important.

Um, I am looking at the problem and I don't see where it actually tells you that the shaded individuals are recessive or dominant; however, because there are fewer shaded individuals than blank individuals, I am assuming that shaded indicates recessive phenotype and blank indicates a dominant phenotype.

The thing to remember when interpreting a pedigree is that they show phenotypes, not genotypes. You can infer genotypes by looking at them but you should be careful not to confuse that distinction.

I think you have individuals 1 and 2 right. He is plainly ff. She is almost certainly FF (if she were Ff, two of her children would probably be ff and have the recessive phenotype; they don't). You are also right about their offspring, 5, 6, 7 and 8.

I think you're also right about 3 and 4. You know for sure that 10 is ff (right again). About 9 and 11, you have no way of knowing whether they are Ff or FF. You actually have 9 as ff (which is wrong and might be what is confusing you). Actually, you know that 9 is Ff, because some of his offspring show a recessive phenotype and they wouldn't if he could only pass on dominant alleles.

12 and 14 are both ff and there is no way of telling whether 13 is Ff or FF.

I hope that's helpful. And sorry again that no one got to it sooner. ;D

Answer 6

Thanks blues :D