A Cross-National Study of Students’ Understanding of Genetics Concepts: Implications from Similarities and Differences in England and Turkey

Table 1

The percentage of students’ correct answers to the first tier and to both tiers of items in TGCT relating to the conceptual categories.

		English students		Turkish students
Conceptual categories	Item number	First tier	Both tiers	First tier	Both tiers
		%	%	%	%
Gene concept	(2)	62.2	48.2	38.6	23.4
	(5)	75.6	73.6	43.0	37.0
	(7)	75.1	43.0	42.7	31.1
	Mean	70.97	54.93	41.43	30.50
Chromosome concept	(3)	28.5	11.4	70.5	32.4
	(8)	53.4	50.3	23.5	20.5
	(13)	36.3	27.5	32.1	20.0
	Mean	39.40	29.73	42.03	24.30
Relationships among gene, chromosome, and DNA	(1)	80.8	72.0	42.3	36.9
	(4)	58.5	56.5	39.6	31.4
	(10)	57.0	42.0	53.8	27.3
	Mean	65.43	56.83	45.23	31.86
Relationships between cell divisions and inheritance	(6)	86.0	74.1	63.5	56.5
	(9)	48.7	39.9	56.3	49.5
	(11)	85.5	70.5	68.8	55.5
	(12)	73.1	61.7	68.9	45.7
	Mean	73.33	61.55	64.38	51.80