Science Assessment ~ Items ~ RH035004

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A skin cell from a cow contains 60 chromosomes. How many chromosomes are found in new skin cells that develop as the cow grows?

30
60
90
120

Details
Performance
NGSS

Topic: Reproduction, Genes, and Heredity
Correct Answer: B
Misconceptions

Distribution of Responses

Chart showing distrubtion of responses for Item RH035004

Students Responding Correctly

Group	Correct	Total	Percent
Overall	697	1623	43%
Grades
6–8	308	932	33%
9–12	389	691	56%
Gender
Male	352	816	43%
Female	331	784	42%
Primary Language
English	616	1444	43%
Other	51	129	40%

View data table

Disciplinary Core Ideas: LS1.B In multicellular organisms individual cells grow and then divide via a process called mitosis, thereby allowing the organism to grow. The organism begins as a single cell (fertilized egg) that divides successively to produce many cells, with each parent cell passing identical genetic material (two variants of each chromosome pair) to both daughter cells. Cellular division and differentiation produce and maintain a complex organism, composed of systems of tissues and organs that work together to meet the needs of the whole organism.