The flowers of periwinkle plants may be blue, B or white, b. Plants may either be normal size, N or dwarf, n. A normal size plant with blue flowers is crossed with a normal sized plant with white flowers. The seeds from this cross produce 33 normal blue plants, 29 normal white plants, 11 dwarf blue plants, and 9 white dwarf plants. Write a hypothesis for the genotypes of the parents and calculate the pheontype ratio of the offspring. Do a Chi-square to test your hypothesis. Indicate your values for "p" Is your hypothesis supported by the chi-square test. AGAIN, I JUST DON'T GET IT. Any easy methods to understanding where to begin? How do you get the initial ratio? Any help is truly appreciated!
More CHI SQUARE PROBLEMS!!!!?
chi squared is eay, once you know the basics, there are five columns, The first is what you observe this is your data, the second is what you would expect, this is just basically using you punnet square ratio to find the value for each, the third is what you observe minus what you expect, the fourth is the previous value squared and the final is the fourth value divided by the expected this is your x^2. to get the original ratio use a punnet square,BbNn is wwhat you would use for the first parent and bbnn for the second, I assume that you know how to set up a punnet square. Then you figure out the ration out of the 16 off spring how many are normal blue, dwarf ble, normal white and dwarf white. FIND THE DECIMAL OR FRACTION VALUE! then using your sample size find your expected ratio the p value is th probability, find your degree of freedom number of categories minus 1 then ther is a handy chart follow this link http://www.ento.vt.edu/~sharov/PopEcol/t...
find the values that yours goes between and go tho the closer of the two follow it up and that is you probability.
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