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 ......
Identical twins are almost always the same sex, but surprisingly there are a tiny
number of boy-girl monozygotic twins. They result from an egg ...
Although discordant karyotypes are known in identical twins, cases involving ...
as DSS/NR0B1, duplication of which can disrupt the male-determining pathway,
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 ... Truly, none of the twins is genetically identical as they have a different
complement of X/Y chromosomes. Their sex chromosomes differ, but ...
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 ...
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.
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.