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The probability of the event given in the question is 0.
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They use punnet squares because it is easy, and accurate. It gives them the probability of the traits, and what the traits are by using upper case, and lower case letters.
Punnet Squares
Punnet squares.
The probability of an event is easily calculated by dividing the number of squares that predict the event by the total number of squares. For example, if a man and woman were having a child, and the man was tall with brown hair and the woman short with blonde hair, the probability of the child being, say, tall with blonde hair, would be 1(number of squares with tall/blonde as a result) divided by 4(total number of squares), which is .25, or 25%
gametes
Probability is predicting the chance of something happening. It can be used in genetics to predict traits we get. Like using punnett squares.
Q: How many letters of alphabet can you make using 5 squares?
The probability of having a boy or a girl is always 50/50 because the female has to X sex chromosomes and the male has one X and one Y sex chromosome. If you do a Punnet Square, there will be two squares with XY and two squares with XX. With four squares in all that makes a 50/50 chance.
1 in 5 is a square so there are 3 squares and 12 non-squares. If the square is not replaced, and the next card is drawn at random the probability of a non-square is 12/14.
What is the question? This question, as phrased, is meaningless.