Biologia IBPaper 2, listopad 2024wzorowane3 pktotwarteśrednie (szac.)
A child has three copies of chromosome 13. A schematic chromosome complement is shown; lengths indicate approximate relative chromosome sizes. (i) Describe how this trisomy could arise during gamete production. (ii) Suggest why an extra copy of one of the…
Biologia IBPaper 3, maj 2023, TZ1wzorowane1 pktotwarteśrednie (szac.)
Cut pear tissue normally darkens when oxygen is available because a polyphenol-oxidizing enzyme converts colourless compounds to pigments. A modified line shows no darkening under the same conditions. Suggest why the modified tissue does not darken.