Web Results



Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ("identical"), meaning that they develop ... Malefemale twins are the most common result, 50 ...

Boy/Girl Twins: Identical Twins of Different Genders - Health


Apr 19, 2016 ... Identical (monozygotic) twins are always of the same sex because they form from a single zygote that contains either male (XY) or female (XX) ...

Types of Twins : Identical, Fraternal & Unusual Twinning | Twin ...


However. it is only the female that has any influence on the chances of having fraternal twins as the male cannot make her release more than one ovum.

Developmental Biology 10e Online: Non-identical Monozygotic Twins


If the aneuploidy were for the X chromosome, one twin might by male (XY or XYY ) while the other would be female (XO). Such male/female "identical twins" have ...

FAQ - Australian Twin Registry


This can happen when two different males father non-identical twins – resulting in half-brothers. ... Sperm cells can survive inside a female's body for 4–5 days.

Re: can identical twins be of opposite genders? - MadSci Network


Jul 11, 1999 ... There have been rare reports of male and female "identical twins" (see references below). Truly, none of the twins is genetically identical as ...

human biology - Are there records of monozygotic twins in which ...


Dec 26, 2012 ... In theory you should get what would be about as close as possible to male/ female identical (monozygotic twins). However, I don't believe it ...

Monozygotic twins of different sex. - NCBI - National Institutes of Health


Mongoloid twins with 48 chromosomes (AA plus A21XXY). ... of monozygotism in spite of a sexual dimorphism: XY male subject and haploid X neuter subject].

Monozygotic twins of opposite sex. - NCBI


We studied identical twins with the 46,XY karyotype - a male with mixed gonadal dysgenesis and a female with "pure" gonadal dysgenesis.

Identical Boy Girl Twins? - Twin Pregnancy and Beyond


I have identical boy twins and was told the other day that identical boy twins are ... Babycenter.com not an hour ago that idetical male and female twinsDo exist, ...

More Info

Identical twins CAN be opposite genders! - BabyandBump


This video excerpt from their site says: Identical twins are. ... This can also happen when the egg is fertilized with the male chromosome, making ...

Can a male and a female be identical twins? - Quora


Identical (monozygotic) twins are nearly identical in terms of genetics, so are almost always the same sex. The exceptions come from very unusual events such...

Can you have identical twins that are male and female? | Yahoo Answers


Jan 29, 2009 ... My boss says that ameoba seperation causes identical twins, but that they can be 1 male and one female. I told him he's insane. Please help ...