Table 4.

Item analysis of different questions in the pretest and posttest in genetics (n = 16)^a

	Pretest				Posttest
General concept	Item number	Bloom's taxonomy	Question	% of correct answers	Item number	Bloom's taxonomy	Question	% of correct answers
Probability	2	Application	Two fertilization events are independent. What is the probability that a couple with two boys will have another boy?	81.3	1	Analysis	Using a mix with 60% adenine, 20% guanine, 10% cytosine, and 10% thymine to make an in vitro polymerization reaction, what is the probability of obtaining an adenine–cytosine–thymine triplet?	75
	6	Application	A bag has seven red balls and two white balls. What is the probability that when drawing two balls, both of them are white?	25	12	Analysis	What is the probability that two carriers for the recessive sickle cell trait have two kids, both affected or both normal?	25
Graph interpretation	3	Analysis	Which type of graph is used to evaluate the relationship between two quantitative variables?	62.5	2	Analysis	Which graph would you use to evaluate the relationship between the height of the plant and the weight of the fruit?	81.25
	4	Analysis	Which type of graph is used to evaluate the distribution of potato weights under certain conditions?	31.3	8	Evaluation	Given a graph with the frequencies of blood types A, B, AB, and O in two different populations, choose the sentence with an adequate interpretation of the data.	50
	11	Evaluation	Given two different graphs that plot the number of individuals with three different genotypes vs. weight, choose the sentence that better describes the data.	18.8	9	Evaluation	Given two different graphs that plot the number of individuals with three different genotypes vs. weight, choose the sentence that better describes the data.	68.75
Correlation coefficient	12	Evaluation	A table with three columns with data from cattle is shown: father weight (Z), mother weight (X), and progeny weight (Y). Interpret the r value.	18.8	3	Evaluation	Given data from height of the plant and weight of the fruit, r = 0.89, determine the association of the two traits.	62.5
p Value	5	Evaluation	Given the average peak size in two populations of Geospiza fortis, and the p value, determine if the differences between the two populations is significant.	56.3	7	Evaluation	Given a graph with the frequencies of blood types A, B, AB, and O in two different populations, choose the sentence with an adequate interpretation of the p value and its statistical significance.	37.5
					4	Creating	The chi-square analysis of a dihybrid cross determines that the differences between the observed and the expected frequencies in F2 are not significant. If the critical value is 0.5, find the associated p value.	25

^aThe alternative choices for each of the questions can be obtained by requesting a copy of the tests from the authors.