If this unequal birth ratio is the result of a greater number of male conceptions, then perhaps the Y-sperm has a slightly better advantage in reaching the egg or penetrating the barrier of follicle cells around the egg, possibly by the smaller size of its head and faster speed. There are a number of hypotheses (tentative explanations) for this unequal birth ratio, most of which are probably not accurate. In the United States, there is a slightly better chance of having a boy, about 105 males to 100 females. Unfortunately in biology, sex ratios in humans are not that easily explained. If enough tosses are made, the number of heads and tails should be very close to 50-50. This ratio can be demonstrated by tossing a coin many times and keeping track of the number of heads and tails. Therefore, the chance of having a boy is 1/2 or 50% and the chance of a girl is also 1/2 or 50%. The male (XY) and female (XX) offspring in the above table are in a 50-50 ratio with an equal number of boys and girls. Since human males produce X-bearing and Y-bearing sperm, and human females produce only X-bearing eggs, the gametes combine randomly according to the following table: This is how the chromosome number in a life cycle changes from haploid (n) to diploid (2n). Sex Determination Is More Complicated Than Tossing A Coinįertilization (syngamy) is the fusion of two haploid gametes (the sperm and the egg) to form a diploid (2n) zygote. Probability Of Sex Determination In Humans Compare this with the chance of winning the state lottery (one in 23 million)! Of course, the chance of being struck by lightning is increased significantly if you stand on a barren mountain summit (above timberline) holding a metal rod during a thunder storm. Staller ( What are the Chances?, Crown Publishers, Inc., New York, 1989), the chance of being struck by lightning in your lifetime is one in 600,000. Since there are different permutations for the six numbers, you must multiply the total probability by six factorial or 6! = 6 X 5 x 4 X 3 X 2 X 1 = 720:ġ/53 X 1/52 X 1/51 X 1/50 X 1/49 X 1/48 X 720 = 720 / 16,529,385,000Īccording to B. The second number is 1/52 because the total number is now reduced by one to 52. The first number is 1/53 because it is one number out of 53 possibilities. The probability of one winner picking all six correct numbers out of 53 numbers is similar to the above question about drawing a royal flush from a deck of cards. Picking Six Out Of 53 Numbers With A Single Ticket Probability Of Winning The California Lottery Then you must consider all the possible orders (permutations) that the cards can be drawn, such as ace-king-queen-jack-ten, ten-jack-queen-king-ace, ace-jack-ten-king-queen, etc. In this case the first card is 20/52 because there are four suits (club, spade, heart & diamond) and five different cards (ace, king, queen, jack & ten) to choose from.
It is more likely to draw a royal flush from a deck of 52 cards if the cards can be drawn in any order. The following mathematical calculation shows the unlikely probability of drawing a royal flush in order from a deck of 52 cards:Ĥ/52 X 1/51 X 1/50 X 1/49 X 1/48 = 4 / 311,875,200 The chance of the second card being a king of the same suit is 1/51 because there is only one king of that suit and there are 51 cards left in the deck. If the cards are drawn in that order from a deck of 52 cards, then the chance of the first card being an ace is 4/52 since there are four aces in the deck and no suit has been specified. The chance of getting a two (snake eyes) is only 1/36.ĭrawing Cards In Order From A Randomly Shuffled DeckĪ royal flush is an ace, king, queen, jack and ten in the same suit. The probability of coming up with a seven is 1/6 (one out of six rolls) because six combinations of red and green dice add up to seven (6/36 = 1/6). Of all the combinations of dots, seven is the most likely number. There are 36 possible combinations when rolling a pair of dice.
0 kommentar(er)
