OCR A Level Biology Chapter 19 Final Exam With Verified Solutions 2024.

Mutation - Answer A change in the genetic material which may affect the phenotype of the organism Substitution - Answer A mutation where one or more nucleotides are substituted for another in a DNA strand Deletion - Answer A mutations where one or more nucleotides are deleted and lost from the DNA strand Insertion - Answer A mutation where one or more extra nucleotides are inserted into a DNA strand Mutagens - Answer Chemical or physical agent which causes mutation Translocation - Answer A section of one chromosome breaks off and joins another non-homologous chromosome Duplication - Answer Sections get duplicated on a chromosome Inversion - Answer A section of chromosome breaks off, is reversed, and then joins back onto the chromosome Heterochromatin - Answer Tightly packed DNA Euchromatin - Answer Loosely packed DNA Acetylation - Answer Addition of acetyl group Methylation - Answer Addition of methyl group