Zygotes

Hey over there :)

This is a tough week, huh? There is sooo much to do, I have to learn for a test on statistics and write an essay in the social psychology lesson. Therefore I completely forgot that I haven't finished publishing my blog about zygots. I'm really sorry about that, so I want to amend this immediately :)

Shortly for all the ones who do not know what a zygote is. A zygote is a base cell, which is usually produced at the moment of the fertizilation by an ovum (female) and sperm (male) cell. These both cells or gamets are haploid (23 chromosomes) and when they come together the chromosomes combine and they constructed zygote becomes a diploid cell (46 chromosomes/ 23 pair chromosomes ). After the fertilization and production of this zygot it comes to the fallopian tube.

Now I'd like to tell you more about the idea of the production of twins. Like we all know there are two different types: 1. the identical twins (monozygotic) and 2. fraternal twins (dyzygotic). Actually I wanted to explain the idea more precisely, but our teacher put a picture, which I think is better that subscribing the process so I'd like to share it with you. Hopefully it won't be a problem :)

By the identical twins only one ovum gets fertilized by a sperm. The produced zygote divides itself into two cells.So there are two cells, which share a placenta. Actually we can say that in this case it is an error of the zygote, from which twins occur.

Talking about dizygotic, we mean the procedure where two different ovums get fertilized by two sperms (one each!!) Also these produced zygotes develop in different placentas. So in this case the babies are actually compeletely seperated from each other, but because they are fertilized at almost the same time and develop at the same time in the same womb and finally were born on the same time, they are called twins.