Jake Burger will wear No. 21

Chromosome 21 is the smallest human chromosome, and procedures for examining human chromosomes were still being developed during the first part of the century. Many early cytologists had ...
Researchers have identified a key gene that drives susceptibility to ‘glue ear’ in people with Down syndrome, paving the way for future targeted therapies.
During this stage, one set of chromosomes is pulled to the sides of ... Topic-based exam practice questions based on GCSE OCR 21st Century past papers, giving you the option to choose the specific ...