anonymous
  • anonymous
Can some explain what how to solve for the fourth generation of a pedigree.
Biology
jamiebookeater
  • jamiebookeater
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wach
  • wach
A fourth generation .. That should be your grandparents, then. I can help you, to an extent. Just describe more on what you're supposed to do, please.
wach
  • wach
Did they give you the first 3 or last 3 generations?
wach
  • wach
Usually, a 4-generation chat goes like this: 1st: You, and siblings 2nd: Your parents 3rd: Your grandparents 4th: Great-grandparents and etc.

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wach
  • wach
Well, if you can find the parents of whoever is in the 3rd generation, you should be able to find your answer. If not, there are certain clues you can deduct from. Like for example, generally the last name(s) of the male(s) in the 3rd generation have the same last name as their parents.
anonymous
  • anonymous
hold on I going to attach a pic
anonymous
  • anonymous
1 Attachment
wach
  • wach
Sorry, I don't really understand. I wish you good luck, though :)
anonymous
  • anonymous
This is the question I am trying to figure out how to do. The pedigree chart below shows the individuals in a family who exhibit in a family who exhibit a certain trait. Based on the information in the chart, what are the chances that a second child born to couple 4-5 in the third generation will show the trait Choices 25% 50% 100% 0%
anonymous
  • anonymous
I know that it is not 50%
anonymous
  • anonymous
Or 0%
wach
  • wach
Oh, I see. So, if the 1st child born to the couple expressed the trait (as shown in yellow) but the parents both didn't, we know that it must be a recessive trait, right? If this trait is represented in terms of T/t, with the small t being the recessive one that gives the trait, that must mean that the parents are both Tt. Does that sort of make sense?
anonymous
  • anonymous
kind of
wach
  • wach
That means a chart for their possible children would be like this: |dw:1344888602483:dw|
anonymous
  • anonymous
I understand the chart but how does this help?
wach
  • wach
Okay. Let's think about the couple, 4 and 5. Assume that circle = female, and square = male. 4's mom displayed the recessive trait, so that means that she was tt. Two of 4's siblings displayed the trait, and two didn't. However, because 4's mom had tt, we can assume that 4 has one t in their genetic coding, and that they're Tt because they didn't display the trait, meaning they got one dominate allele.
wach
  • wach
The same reasoning goes for 5's dad, who had tt because they displayed the trait. But 5 themself didn't display the trait, meaning they're Tt. Does that sort of make sense?
anonymous
  • anonymous
yes
wach
  • wach
So, the table that I drew shows the possible outcomes for 4 and 5's kids. There is a 75% chance that the kid won't display the trait (TT, Tt, and Tt are dominate) There is a 35% chance the kid will display the trait (tt) Does that answer your question? :)
anonymous
  • anonymous
Yes, thank you so much :)
anonymous
  • anonymous
so it would ebe 0?

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