Since the subject of twins has arisen, I want to bring up the topic of
heritability calculations. We know of the myriad problems we have in
interpreting these and there might be one more. MZ twins are always of the
same sex. DZ twins may or may not be. Yet many textbooks claim that the
higher conco
- Original Message -
From: <[EMAIL PROTECTED]>
To: "Teaching in the Psychological Sciences (TIPS)"
Sent: Thursday, November 09, 2006 8:26 PM
Subject: [tips] Donald Duck (1924-2006)
Donald Duck is dead.
is Sylvester the cat still alive?
Michael Sylvester,PhD
Daytona Beach,Florid
Donald Duck is dead.
His obituary appears today in the November, 2006 issue of the British
Medical Journal.
With stereotypic British understatement, the obituary writer notes,
"Having a keen sense of humour, he enjoyed many situations where his name
led to confusion".
Consequently, I expect t
Annette Taylor asked about a pair of fraternal twins who were identical in
appearance,
according to one of her students.
John Kulig replied:
> I'm not an expert, but, a certain % of twins are misclassified. It's my
> understanding that, short of DNA markers, you can ask a series of simple
> q
I'm not an expert, but, a certain % of twins are misclassified. It's my
understanding that, short of DNA markers, you can ask a series of simple
questions, such as do they have the same hair color, texture, eye color,
etc. and be more than 90% correct. Also, a key question is to rate the
difficult
Since I am a twin (fraternal, and not looking very much like my twin), I've
always been very interested in twin studies. I think Annette's student is
echoing our culture's assumptions that twins are treated differently, and that
identical twins are treated even more differently than unalike
Yesterday in class we were talking about nature/nurture and the
concordance rates among MZ and DZ twins on various characteristics.
A student sent me this follow-up email to the discussion:
"I was just curious because I have really close friends that are fraternal
twins yet they look EXACTLY a
Not my morning to hit the streets. I woke up this morning about 4:30
am, walked
into the guest room that doubles as the computer room, turned on the computer,
walked into
the kitchen, made a freshly brewed pot of coffee, waited interminably for the
watched pot
to drip enough to fill my
