Biology 5090 · O Level · DNA

DNA — practice question

A student made some mistakes in statements about chromosomes. 1 A human body cell has $46$ pairs of chromosomes. 2 Chromosomes are found in pairs in gametes. 3 Each body cell in a male has one $X$ chromosome and one $Y$ chromosome. 4 A chromosome contains one long DNA molecule that is divided into sections called genes. 5 Genes are split into sections called DNA molecules, which are included in chromosomes. Which two statements are correct?

  • A1 and 2
  • B1 and 3
  • C2 and 5
  • D3 and 4

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