Twins are two offspring produced by the same pregnancy. Twins can be either
monozygotic ..... There can be monozygotic boy/girl twins if the sex gene of the
embryo has an extra x chromosome (the ......
This article examines the issue of identical twins of different genders, and the
exception of transgender twins. ... Identical (monozygotic) twins are always of the
same sex because they form ... Therefore, boy/girl twins are always fraternal or (
dizygotic); they can only ... After it splits, there are either two males or two females
Like singleton siblings. they share 50% of their DNA. ... Two-thirds of all twin
births result in same sex fraternal twins and one-third are different sex fraternal
twins. ... of identical twins and are identical twins with opposite features. that is
one will ...
Jul 11, 1999 ... Of these 23 sets, one set determines a person's sex - we call this ... There have
been rare reports of male and female "identical twins" (see ...
Identical twins are always the same sex and blood type. Identical ... They can be
of opposite sex. ... For identical twins, there is only one egg and one sperm.
Oct 1, 2015 ... And male/female twins certainly don't look identical! ... The result can be a MZ
twin pair of opposite sexes. ... Second example: There could be a glitch in
copying sex chromosomes during the formation of sperm or egg cells, ...
Simply, they're identical twins, originating from the same embryo, but ... chimeras
only survive when their genes combine in such a way that they code ... I'm not
sure if cojoined identical twins could have opposite gender since ...
Can fraternal twins look so similar that they are mistaken for identical? ....
Identical twins are always the same sex; they usually are the same height, weight
and ... teeth eruption; Some mirror image twins cross their legs opposite each
Sep 15, 2012 ... And how does that affect their adult romantic relationships? ... My girlfriend is an
opposite-sex twin and I've often wondered how the bond she ... and believes that
these pairings are less visible than identical or same-sex twins.
Oct 29, 2014 ... Given identical twin males, Michael and Douglas, Douglas and his wife have ...
the other twin will have children all of the same (or opposite) gender? ... rather a
question regarding research of identical twins and their offspring.