Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

myininaya

So I know this person, not personally, but they have one green eye and one blue eye. So I guess they carry both recessive genes for blue and green, right? But is there a more dominant eye color of these recessive eye colors? Which is more likely to occur in offspring? Blue eyes? Green eyes? Or both?

  • one year ago
  • one year ago

  • This Question is Closed
  1. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    Was this person a female, by any chance? I ask because quite a few eye color genes (there are more than 15 and of those fifteen there are many variants or alleles) are X linked, or if not located on the X chromosome then controlled by protein products of genes on the X chromosome. Cells can only live with one active X chromosome - two affects the dosages of gene products in bad (read 'lethal') ways, so in all the cell lineages that form during development, one of the two X chromosomes compacts itself into a little package and sits idly by. It is incredible that females don't wind up looking like patchworks anyway as that is what they are - it's just that one X chromosome (with the blue set of alleles) got inactivated in the cell line which gave rise to one eye and the other X chromosome (with the green set of alleles) got in the other eye.

    • one year ago
  2. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    And which occurs in her offspring depends on which X chromosome she passes on to them. Equal probability, I'd say. The kid with the green X would have green eyes and the kid with the blue X would have blue eyes - dependent of course on what they get from their Dad. The question is whether the odd pattern of X inactivation is itself X dependent, in which case she would be more likely to have children with mixed eye colors. And that I don't know off the top of my head but I can definitely read up on.

    • one year ago
  3. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    But only if those children of hers were girls. Boys only have the one X, so no inactivation occurs.

    • one year ago
  4. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh ok. So the probability of the males having these type of mixed eye color thing going on is zero?

    • one year ago
  5. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    Or close to zero?

    • one year ago
  6. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    If X inactivation is actually the cause of it, yes, zero. Females have two X chromosomes, but only one can be active so the other shrivels up as discussed above. Males have an X and a Y, so no need for the second (missing) X to be inactivated. Mom passes of the two X chromosomes onto all offspring. And that X will either have the blue set of genes or the green set of genes.

    • one year ago
  7. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok I'm about to give you a medal. lol. Nice information hector :)

    • one year ago
  8. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    My pleasure. You should come to bio more often. :D

    • one year ago
  9. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    Just in case you wanted to look at this

    • one year ago
  10. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    Oh that's totally whacked.

    • one year ago
  11. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    I'll link to it in the Feedback thread so they find it.

    • one year ago
  12. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    lol but really good information on the genetic stuff. I really liked in when I took just that one biology class. We made babies with other students in the class. My family had two moms because there were too many girls in the class.

    • one year ago
  13. hectoroftroy
    Best Response
    You've already chosen the best response.
    Medals 5

    What a cute lab. We shook a paper bag full of alleles and made baby dragons in ours...

    • one year ago
  14. lgbasallote
    Best Response
    You've already chosen the best response.
    Medals 0

    i wanted to know what @myininaya was talking about so...

    • one year ago
  15. lgbasallote
    Best Response
    You've already chosen the best response.
    Medals 0

    on a related question @hectoroftroy is it possible to have a green eye AND a blue eye?

    • one year ago
  16. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    yes i seen it before

    • one year ago
  17. lgbasallote
    Best Response
    You've already chosen the best response.
    Medals 0

    wow that's cool...having two of the coolest eye colors...i'd love to be just blue eyed though..*sigh* if only snatching eyes was legal :(

    • one year ago
  18. myininaya
    Best Response
    You've already chosen the best response.
    Medals 0

    I have blue eyes :)

    • one year ago
  19. lgbasallote
    Best Response
    You've already chosen the best response.
    Medals 0

    perfect >:))))) *hisssss*

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.