Pearson Edexcel Level 3 GCE, Biology B Advanced PAPER 1: Advanced Biochemistry, Microbiology and Genetics. question booklet mark scheme results November 2021

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Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 The ... polymerase chain reaction (PCR) and gel electrophoresis are used to produce DNA profiles. The diagram shows DNA profiles, from an adult female, an adult male and each of four children. Adult female Adult male Child 1 Child 2 Child 3 Child 4 (a) Explain why PCR is used before gel electrophoresis to produce these DNA profiles. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ............................................................................................................................................................. [Show More]

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