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creighton

  • 2 years ago

Can some explain what how to solve for the fourth generation of a pedigree.

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  1. wach
    • 2 years ago
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    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.

  2. wach
    • 2 years ago
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    Did they give you the first 3 or last 3 generations?

  3. wach
    • 2 years ago
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    Usually, a 4-generation chat goes like this: 1st: You, and siblings 2nd: Your parents 3rd: Your grandparents 4th: Great-grandparents and etc.

  4. wach
    • 2 years ago
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    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.

  5. creighton
    • 2 years ago
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    hold on I going to attach a pic

  6. creighton
    • 2 years ago
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  7. wach
    • 2 years ago
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    Sorry, I don't really understand. I wish you good luck, though :)

  8. creighton
    • 2 years ago
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    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%

  9. creighton
    • 2 years ago
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    I know that it is not 50%

  10. creighton
    • 2 years ago
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    Or 0%

  11. wach
    • 2 years ago
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    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?

  12. creighton
    • 2 years ago
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    kind of

  13. wach
    • 2 years ago
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    That means a chart for their possible children would be like this: |dw:1344888602483:dw|

  14. creighton
    • 2 years ago
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    I understand the chart but how does this help?

  15. wach
    • 2 years ago
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    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.

  16. wach
    • 2 years ago
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    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?

  17. creighton
    • 2 years ago
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    yes

  18. wach
    • 2 years ago
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    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? :)

  19. creighton
    • 2 years ago
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    Yes, thank you so much :)

  20. bbbco123
    • one year ago
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    so it would ebe 0?

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