I know when a fertilzed egg goes into cell division, they divide into even numbers. What makes an identical triplet? I'm an idental triplet. I know I am cause my brothers and I shared one placenta.
210166
Either the egg divided twice into four as above, or the egg divided once into two blastomere and then one of those divided again into another two making a total of three.
397769
Hi! I'm the mother of identical twins.  There's alot of misinformation out there.  Here's a few facts:\n\n1. Identical twins are from the same fertilized egg that splits so identical twins have identical DNA.  However, this does not mean that they will look exactly alike.  I can tell my identical twins apart easily and even strangers can look closely and notice subtle differences.\n\n2. Fraternal twins are from two seperate eggs that are fertilized at the same time.  They are basically just brothers/sisters who happen to be born at the same time.  You would expect them to look as similiar (or disimiliar) as siblings born years apart.\n\n3. Really, there's no reason why you should hesitate to ask them if they are fraternal or identical.  They'll probably appreciate that you actually know that there are different types of twins and that you didn't assume they were a certain type.\n\nHope this helps!
26141
I believe identical twins and fraternal twins are both hereditary. It is quite common what your cousin has experienced.
668599
I agree, It's a) law of segregation. \n\n\nDuring Meiosis, the each chromosome pair is separated (segregated) into different daughter cells. 1 chromosome will end up in two daughter cells (1 copy in each cell) and the other chromosome in the other two daughter cells (1 copy in each cell)
488744
26\n\nIn meiosis, the chromosome pairs are divided in half so the new cell has 1 of each.  This is because this is used to produce cells for reproduction.\n\nWhen 2 of these cells come together,they create 52 chromosomes again to create a new organism with half of each parents genetic material.
572526
more of a biology question then a chemistry question...\nBut sister chromatids are two identical chromosomes held together by a centromere. They occur during cell replocation, and are pulled apart, giving each daughter cell all the chromosomes needed. \nSo if they are identical chromosomes, all the genes would be in the same order. Alleles only differ from one another during miosis, not mitiosis.\nFrom all of this, you should be able to figure it out.
518279
lol. Yea i am an identical twin. And the whole finishing each others sentences and knowing what the other is thinking isn't that strange to me anymore, but other people sure do get a kick out of it. They say its called the "freaky twin thing". mmm.... like actually today (the 19th) is our birthday and unfortunately we are split up now for college. (This is the longest we've ever been apart) and i called her to ask her what she was doing. And she said she was eating and i said i was too, chicken Parmesan (or how ever its spelt) and then she said "oh my god!" and i said "let me guess you are too?" Its just weird stuff like that. She'll have some great idea about something, and then I'll start talking about it and she wont even have to tell me what it is. Its kinda funny. But to me its just life.
512352
In identical twins one is is a natural clone of the other.  If science ever really created an artificial clone, it would have the same right to life as anyone else.  But I do not expect a responsible scientist to do that.  What they're up to is creating stem cells for use in curing a variety of diseases.  Those who oppose this are phonies about their respect for life.
521562
During prophase 1 of meiosis, the chromosomes have duplicated and have joined with their homologous pair to form a 4 stranded tetrad.\n\nBecause you get one chromosome in each homologous pair from your mother and one from your father, although they code for the same concepts, they may code slightly differently (ie blue eyes vs brown eyes).\n\nTo exchange genetic material, during prophase one the two chromatids closest together in the tetrad (one from each mom and dad- the outer two are too far away to do this, so they remain untouched) "cross over".  Literally, the ends of the chromatids cross each other and bits of the chromosomes break off of one and reattach on the other, giving genetic variability.\n\nOk, so for example: the chromosome your mother gave you coded for blue eyes, blonde hair, curly hair, and long fingers.\nThe chromosome from your father codes for the same principles, just differently- say brown eyes, red hair, straight hair and short fingers.\n\nSo crossing over between these two occur in prophase 1, and some codes are swapped.\n\nNow we have a tetrad (4 chromatids) that code for the following.\n(We'll say the chromosome from mother is on the left and from father is on the right)\nStarting with the leftmost and going to the rightmost:\nChromatid 1 codes for: \n-blue eyes, blonde hair, curly hair, and long fingers\nChromatid 2 codes for:\n-blue eyes, brown hair, curly hair, and short fingers.\nChromatid 3 codes for:\n-brown eyes, blonde hair, straight hair, and long fingers\nChromatid 4 codes for:\n-brown eyes, brown hair, straight hair and short fingers.\n\nSo now we have the genetic variability, and 4 completely unique chromatids, that are still homologous pairs, just giving us four different codings for the same traits.\n\nHope this helps.
93743
The father's DNA is the determining factor. Since you and your sister had the same father, you have the same genes.  Therefore, it is quite possible for you and your sister to be identical.
433586
30) I'd say A.  Because there is a duplication of chromatids in both Meiosis I and in mitosis. It's NOT B for sure because mitosis produces only 2 cells.  It can't be D either, because chromatids are prensent in both processes.\n\n31) They are all happening in both.  so E\n\n40) C because gametes (like sperm and eggs) are cells ready for fecondation.  they only have HALF the chromosome set.\n\n41) I'd go with E.  Homologues are always paired, that is until the anaphase, so A and D got to be right.  Cross over is an exchange of genes between the two homologues, which is C.  The answer E talks of anaphase, which is the breakage of the centromeres.
87524
They're not always opposite gender. "Fraternal twins" can mean the opposite of "identical twins". Sometimes called dizygotic, it means that although they are twins, they developed from two different eggs, not one. They therefore share only 50% of their genes (the same as any two non-twin sibs), rather than 100% that identical twins share.
384634
Meiosis consists of 2 nuclear divisions that reduce the # of chromosomes to the haploid # (n) in preparing for sexual reproduction. Not Diploid (2n).\n\nThe fertilization of the haploid cells, sperm and ova, is the diploid cell (zygote) which gives a 50% chance of daughter cells being maternal or paternal.\n\n# of possible combinations = 2 to the nth power (2 ^n)\nso, if 2n=6, then n=3 and there is 2 ^3 = 8 number of combinations.
261845
My two cluckers came out of eggs.  Did you know that there are two chickens for every human being on earth?  That's a lot of cluckers.\n\n\nChickens rule.
551291
Ans. #2\nThis is a modern description of what occurs. However,I don't believe \n  that  ole'  Greg ever used the words "alleles" or "gametes" back in the days  at the monestery.
242710
In Mexico we called them "cuates" (plural) and they are not twins, they are not identical. This happens when two eggs are fertilized by two different sperms. As the other person said whether they are from different dads (natural way), or she got pregnant, in vitro and two sperms fertilized two of her eggs.\nOr as the other person said they could have been born one monday of any month and the other baby other monday of other month. But it's the same day.\nOr what happenned?
423732
1. b, because even if the father was heterzygous, there would still be a 3:1 ratio of brown eyed offspring\n2.d, autotrophs are organisms that produce their own food and do not need to  get nutrients from other sources\n3. True, I believe that fertilization occurs in all sexuallly reproducing species, but there are some organisms that reproduce asexually, but you may not be talking about those.\n4. False, There are asexual organisms that are eukaryotic