In Victoria, you can have two types of abortion: surgical and medication. Both types are safe and reliable. You can have a medication abortion up to nine weeks of pregnancy.
You can have a surgical abortion from around six weeks of pregnancy onwards. Age affects the fertility of both men and women, and is the single biggest factor affecting a woman? Androgen deficiency in women and its treatment is controversial, and more research is needed. IVF in-vitro-fertilization and ICSI intracytoplasmic sperm injection are assisted reproductive treatment ART procedures in which fertilisation of an egg occurs outside the body.
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The State of Victoria and the Department of Health shall not bear any liability for reliance by any user on the materials contained on this website. Skip to main content. Reproductive system - female. Home Reproductive system - female. Twins - identical and fraternal. Actions for this page Listen Print. On this page. Multiple births are more common than they were in the past, due to the advancing average age of mothers and the associated rise in assisted reproductive techniques, in particular the use of fertility drugs.
Twins account for over 90 per cent of multiple births. There are two types of twins — identical monozygotic and fraternal dizygotic. To form identical twins, one fertilised egg ovum splits and develops two babies with exactly the same genetic information. You can also search for this author in PubMed Google Scholar.
Reprints and Permissions. Whitfield, J. Nature Download citation. Published : 26 March Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article. Provided by the Springer Nature SharedIt content-sharing initiative. Advanced search. Skip to main content Thank you for visiting nature. And as those cells divide and multiply, at some point very early in embryonic growth they split into two individuals.
So that you can imagine that the genetic material in these two identical twins is identical to each other, hence the name. The contrast to this would be fraternal twins, which are twins born at the same time. However, they are actually the result of fertilization of two different eggs, and thus can be different genders and look different, and have different characteristics.
What's becoming increasingly clear is even though we call identical twins identical, and we think of their genetic material as being identical, we need to be reminded that there are environmental influences that may change, actually, the characteristics of identical twins, reminding us, as we already know, that even though identical twins come from the same genetic material, in characteristics they may actually have differences as well.
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