I am pregnant and have been told that due to my age (I was 36 last month) I have a 1 in 300 chance of having a baby with Downs Syndrome.\n\nI've never been any good at maths. Does anyone know what 1 in 300 is expressed as a percentage please? I can't picture it as 1 in 300 I need to know what the odds are as a percentage.\n\nThank you in advance
216447
The percentage for 1 in every 300 people is 0.333%\nThis is a very small percentage so I wouldn't worry. My mom actually had me when she was 34 (and look...I can do math! ;) hehe) She had one of my sisters at age 37 and my youngest sister at age 40. All of us perfectly normal. No problems at all. Also, my mom actually had problems with some kids she was trying to have before myself (my brother who would have been older than me passed away in a week and my mom was at age 30)\nCongratulations in advance! :)
606751
30-35% chance of becoming pregnant.  First, you have to ovulate at the right time.  Then you have to have intercourse at the right time and the sperm have to find their way to the correct fallopian tube which has the ovulating ovary at the end.  The sperm are fighting pH and all kinds of other "killer" stuff in your vagina, cervix, and uterus.  Half of them die for the "good" of the others and it's a rough time.  Finally, they have to break through the egg's defenses.  So, if everything was perfectly timed, then you could be pregnant.  It's almost like a game of chance.\n\nGood luck!
337567
Only if a genetically recessive trait runs in the family and both the guy and his sister have the defective chromosome, only then does the baby risk having a birth defect or mental retardation - even then(ie, with the defective recessive chromosome in both), the chance would be 1 abnormal child out of 4. If the guy and the sister have no such defective chromosomes, then the question of an abnormal/retarded child does not arise.\n\nIf, however, a genetically dominant trait runs in the family and either the guy or his sister have the defective chromosome, then the risk increases to 1 in 2  and if both have it, then the risk is 3 out of 4.\n\nIn any case, whether the baby will be normal or abnormal cannot be determined until a karyotyping of both the guy and his sis is done. Having said that, the rate of such disorders is quite low and in all probability, the child will be normal.
248080
better get an EPT and find out...sounds like there is a good chance of it. \nour baby is the joy of our life, if she is she needs to know asap so she can start taking prenatel vitamins and taking good care of her self. \nBest Wishes...this is a big deal and really serious. be positive and know that each and everyone of us are here because of the same condition. it will all work out one way or another. stay positive! Life is a gift...this could be the most important thing she ever does. Do it right and learn as much as you can together. your help is going to mean a lot to her, plus you will be an Auntie!!!!
216981
Why all these people are saying its 50/50 I have no idea.  It certainly is NOT 50/50, the chance varies for every individual.  Some males have more sperm with the X chromosome and some have more sperm with the Y chromosome.  Very few, if any, males have an exact 50/50 ratio.
10512
Sometimes, it's easier to find the probability of the opposite case you are looking for.  This is one of those times.  Try to find the probability that you don't get the right one.\n\nAfter taking you two chances, one of the three objects is left.  What are the chances that this one that is left is the right one? The one that is left is one of three, so there is a 33.3% chance that it is left behind- which means there is a 33.3% chance that you DID NOT get the right one.  Therefore, there is a 66.7% chance that you WILL get the right one. \n\nIf you are still not convinced, it is easy to show that your reasoning that got you to 83% is wrong.  What if you used the same reasoning with 4 objects and 3 chances to get the "right" one.  Your logic would say there is a 25% chance the first time, a 33% chance the second time, and a 50% chance the third time.  If you just added them (as you did to get 83%), you would find that 25% + 33% + 50% = 108%.  Clearly you can't have a percentage above 100%, which illustrates the problem with that reasoning.\n\nHere's why that reasoning dosn't work; 33% of the times you play this game, your second try has a 0% probability of getting the right one because you already got it on the first try.  The other 66% of the times you play the game, your second try has a 50% probability.  So the AVERAGE probaility of the second try is (33.3% x 0%) + (66.7% x 50%), or 33.6%.  Add this 33.3% to the 33.3% probability of the first try, and you get the correct answer of 66.7%.\n\nIf you still aren't convinced, come over some time for a "friendly" game of dice.
184539
Although this seems to be a problem about Gregor Mendel and his tall and dwarf pea plants, once it is realised that the probability of any child being short is 1/2, it simplifies to being the simpler and more familiar one of tossing a coin, heads or tails, n times\n\nIt would have produced more interesting results perhaps if the parents were Aa and Aa and three children out of four were therefore tall and we had looked at grandchildren (offspring of children who are one quarter AA, one half Aa and one quarter aa, eg if they intermarry with another such distribution among their partners.) However ...\n\n(i) is imprecisely worded. How big is the family?\n\nIf there is one child, the chance of that child being short is  1/2\n\nIf there are two children, the chance that both are tall is 1/4 and the chance that at least one child is short is 3/4. (Of one being short is 1/2 and of both being short is a quarter.)\n\nIf there are three children, the chance that all three are tall is 1/8 and the chance that at least one child is short is 7/8 (of one being short: 3/8, of two being short also 3/8, of all three being short: 1/8).\n\nWith 4 children, the chance of at least 1 being short is 15/16, of 1  being short is 4/16 or 1/4; of 2 being short is 6/16 or 3/8; of 3   being short is 4/16 or 1/4; of all 4 being short is 1/16;\n\nOne just reads across successive lines of Pascal's Triangle.\n\n(ii) the answer to this is buried in the above: 3/8ths\n\n(iii) again, imprecisely phrased. Does "such families" refer back to (i) or to (ii)? Taking it to mean families of four children, there is one chance in 16 of 4 tall children, 4 chances in 16 of 3 tall children, 6 chances in 16 of 2 tall children, 4 chances in 16 of 1 tall child and 1 chance in 16 of 0 tall children.\n\nIn 16 such families, there are 64 children and unsurprisingly 32 are tall\n(1 x 4) + (4 x 3) + (6 x 2) + (4 x 1) + 0\n\nwith an average number of 2 tall children per family, and as you would expect an average number of 2 short children per family, too.\n\n(iv) 256 = 16 squared and so the expectation is 16 families out of 256 will have 4 tall children, given 1 family in 16 has this particular expectation.
416657
Yes NHS is crap, similar experience here and I lost my little girl, stillborn at 40 weeks, she had only been dead a week, cord wrapped around her neck. I'd visited my doctor and gynaecologist earlier in the week and they never picked up on it. I knew she'd stopped moving as much but stepmum said it was the calm before the storm. Took me in to start me off, did a scan and told me she was dead, and I'd have to give birth naturally. Sheer hell I'll never forget it. So get your husband to kick but as much as he has to till they take notice. Be careful and good luck. X
288802
Angel , on 12June if u have conceived...sure u r in hurry and anxious to have a baby...but its not 1+1=2 its more then that...just doing it is doesn't make u conceive every time...just relax and leave it to god..don't get too optimistic it will only put pressure on u..which is not at all good to get pregnant. wishing u good luck
494089
If you haven't been having irregular periods and if you are a healthy lady, I don't see a problem. Maybe it is the guy. Don't be worried. Check in with a doctor. I have seen some patients come in and are put on birth control for a couple months to help them have babies. Therefore, the doctor may diagnosis your symptoms. However, I hope there is a real psychic out here who would be able to help you.  But they would really have to say more about you to know that they are real. Hang in there. Even at 35 babies are still healthy and possible. Take care and try not to stress over it to much your time will come when god chooses the right child for you. I hope my comment help in some way.
92715
IMO, fb2kool is on to something.  Luck is used to describe a short series of events that appear to deviate from the average (when they simply contribute to the average).  The strange thing about probability is that the "average" never seems to happen.
77426
Well dear thanks for my reply related to timing of North Carolina..By the way to conceive pregnancy after 45 it is not advisable because of the chances of severe genetic disorders like down syndrome, Mongolian syndrome etc are existed in offspring so you better get inquiry from medical sources. thanks
554922
Did it occur to you for even a moment that you could find extremely good resources by going to the library and/or a quick google search??? There is a NATIONAL DOWN SYNDROME SOCIETY for pete's sake. Everything you want to know is there, plus try the National Institutes of Health site.\n\nthumbstrolls strike again
58530
Mine are 1 and 3 which together are 13.  I was born on the 13th and everyone seems to think it's an unlucky number but I love it because everyone seems to stay away from it.  It always pops up, such as right now when I scrolled down for questions and yours was asked 13 hours ago!
339424
First you have to make out your alleles.  Your first parent PpLl will produce spermatozoids that can be either PL Pl pL pl.  As for the mother, she is also heterozygotous for both traits, so she is also PpLl and will produce eggs that are either PL Pl pL or pl.  The you make the Punnett square with all those four colomns and four rows.  You should get something like\n___|_PL__|_Pl_|_pL_|_pl__\nPL_|_PPLL|_PPLl_|_PpLL_|_PpLl_\nPl_|PPLl|_PPll_|_PpLl_|_Ppll_\npL_|PpLL_|_PpLl_|_ppLL_|_ppLl_\npl_|PpLl_|_Ppll_|_ppLl_|_ppll_\n\nOKAY NOW...\nPPLL means healthy all the way\nppll means has all the diseases\nIn between they are heterozygotous for one or both disease.\n\nSince you have 16 possibilities, then yes your 1/16 answer is correct for the probabilities of having both diseases\n\ncan you do the square for your second problem :-)
631577
Uh, in the third tri-mester?  I'm having a hard time figuring out when pri - mortal begins?  Conception?  Third trimester?  Birth?  Geez, this is a toughie.  Why, I'll wager there are lots of folks debating this topic all over the world.
31730
hmmm... 3 0 2 4\nThree Zero Two Four\nThree Thousand and Twenty Four...\n\nYes.. definately, the moment I hear (have I?) it .. I think.. where would the world be if Men went into labour & got preggerz or where would Y! Answers be without some dumba** questions being thrown at with dumb*ss answers like this