Gene Expression

Genetic conundrum

Obviously a sex-linked trait. All males seem to exhibit the trait but none of the females. It can’t just be the lack of something on the X, otherwise some of the females would have exhibited this trait as well. No, perhaps a mutant on the Y which acts in a trans & “dominant” acting manner to repress or abolish something on other chromosomes?

Note: All the males exhibit the phenotype, but none of the females do. If you accept it is a sex-linked trait which manifests because the males don’t have a compensatory copy of the allele inherited from the mother, then all their mothers had to have at least one copy of the “bad” allele. That means that random mating implies that at least 1/4 of the women in the current generation would exhibit the trait (assume that all the mothers are heterozygous), as they would inherit a “bad” copy from both parents. If all the males exhibit the trait, but none of the females do, that would imply something that acts dominantly from the Y chromosome, which only males have.

Comments

  1. #1 Agnostic
    April 20, 2007

    If midget humor is your thing, check out Wee Man from Jackass as an Oompa Loompa skateboarder:
    http://www.youtube.com/watch?v=GrLjBpj4Mr4

    Throughout the TV episodes of Jackass, a running gag was having the morbidly obese guy chase the little guy around busy streets in broad daylight, both wearing just briefs and wife-beaters, the camera catching the shocked expressions of pedestrians.

    For the movie Jackass Number Two, they went to India to film several scenes, one of which you can see here — warning, though, only watch from 2:27-2:50 for the skit. Lots of the rest is NSFW and some is homoerotic:
    http://www.youtube.com/watch?v=0N3iSqkk2XA

  2. #2 Kambiz Kamrani
    April 20, 2007

    The sex linked hypothesis is valid if the men and women have been in one isolated population. The other, more explainable situation, could be a matter of Bollywood directors bringing a whole lot of small men to film this unique music video.

  3. #3 John Wilkins
    April 21, 2007

    Of course! Moustaches and facial hair in general is a Y chromosomal phenotype, surely…

  4. #4 razib
    April 21, 2007

    The other, more explainable situation, could be a matter of Bollywood directors bringing a whole lot of small men to film this unique music video.

    it isn’t hindu, i can attest that from listening. these are aliens with indian accents. so, not bollywood.

  5. #5 Magnus W
    April 21, 2007

    However, I want the lyrics!

  6. #6 Kambiz Kamrani
    April 21, 2007

    I was under the impression that Bollywood is a term used for the Indian movie industry, regardless of Hindu, Tamil, Malayalam, etc. The actors are singing in Malayalam.

    Aside from that, the point I was making is that this is a staged movie with, “no less than 300 real dwarfs,” according to this review of it.

  7. #7 razib
    April 21, 2007

    I was under the impression that Bollywood is a term used for the Indian movie industry, regardless of Hindu, Tamil, Malayalam, etc. The actors are singing in Malayalam.

    nope. bollywood = hindi films (based out of bombay). tollywood = telugu films. don’t know what the others are called. lollywood = pakistan i think? bengali ‘art films’ would not want to be classed under bollywood for obvious reasons….

    here is wiki on bollywood:
    is the informal name given to the popular Mumbai-based Hindi language film industry in India. The term is often incorrectly used to refer to the whole of Indian cinema.

    there isn’t an exact def., but my understanding is that brownz understand bollywood to be hindi language films….

  8. #8 razib
    April 21, 2007

    and thanks for clearing up the population’s demographic history ;-)

  9. #9 John Emerson
    April 21, 2007

    Who cares what the brown people think? It’s all Bollywood, especially if it’s as goofy as that.

  10. #10 Sandgroper
    April 22, 2007

    The girls looked like they were getting warmed up for a spot of dwarf tossing there.