8/9/2019 A Probable Situation-Lab

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A Probable Situation

Genetics Probability experiment

BackgroundAs you begin your study of genetics, you will learn about probability. Probability is

the possibility or likelihood, that a certain event will take place. In this activity you

will perform some experiments with probability. It comes down to a coin ip model.

hen you ip a coin, it will either end up being heads or tails. !ou have a "#$

probability of predicting the correct outcome.

Materials:

%ed &onstruction Paper

'reen &onstruction Paper

Scissors

(etric %uler

) small paper bags

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Procedure:Part A

*. &ut four s+uares, cm on a side, from a sheet of red construction paper. -othe same with a sheet of green construction paper.). &rumple each paper s+uare into a small ball. !ou should have four red balls

and four green balls. /sing a marking pen0pencil0pen label one paper 1A' * and the other, 1A' )2. Place two red balls in bag * and ) green balls in bag ).". ithout looking, remove one ball from bag *. %ecord the color of the ball in

-ata table A next to 3rial *. Put the ball back into the bag.. %epeat step " for bag )4. In the %esults0-ata column of the -ata 3able, record the colors of the two

balls. rite %% if you removed two red balls, '' for two green balls and %'

for one red and one green5. %epeat steps " to 4 6I67 more times. %ecord your results for 3rials ) through

*# in the -ata 3able.

Part B

*. 8eave the two red balls in 1ag *,m and replace one of the green balls in 1ag

) with a red ball. Shake the bags.). ithout looking, remove a ball from 1ag *. %ecord the color in -ata 3able 1.

%eturn the ball to bag *.. %epeat step ) for 1ag )2. %ecord your results in the %esults0-ata column of -ata 3able 1

". %epeat steps ) to 2 6I67 more times. %ecord your results for 3rials ) through*# in the -ata 3able.

Part C

*. %eplace one of the red balls in 1ag * with a green ball. 8eave the red and

green ball in 1ag ). Shake the bags). ithout looking, remove a ball from 1ag *. %ecord the color in -ata 3able &.

%eturn the ball to bag *.. %epeat step ) for 1ag )2. %ecord your results in the %esults0-ata column of -ata 3able &". %epeat steps ) through 2 6I67 more times. %ecord !our results for 3rials )

through *# in -ata 3able &

Part D

*. 8eave the red and green balls in 1ag * and replace the red ball in bag ) with

a green ball. Shake the bags). ithout looking, remove a ball from 1ag *. %ecord the color in -ata 3able -.

%eturn the ball to bag *.

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. %epeat step ) for 1ag )2. %ecord your results in the %esults0-ata column of -ata 3able -". %epeat steps ) through 2 6I67 more times. %ecord !our results for 3rials )

through *# in -ata 3able -

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Analysis and Conclusion

*. In which Part of the experiment was there only one possible outcome9 hy9

). hich part of the experiment had the most possible outcomes9 :ow many

outcomes9

. hich parts of the experiment had two possible outcomes that were e+ually

likely9

2. :ow many outcomes would be possible if you put two red balls in both bags9

If you put two green balls in both bags9 hy9

". Suppose you were to decide that red is a ;Stronger< color than green, so that

every time you get at least one red ball the outcome is considered red.

hich combinations = %%, %' or ''> would be considered red9

. hat would be the only combination that could be considered green9

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4. 8ook over your results for Parts A, 1, &, ? -. Suppose that red is the

;stronger< color. Add up the number of red outcomes and the number of

green outcomes. %ecord your results in the following table

Part %ed 'reen 3otal

A

1

&

-

5. hich parts had no green outcomes9 hy9