A diploid species of wild oat (Avena barbata) has a chromosome number of 2n=182n = 182n=18. During meiosis, homologous chromosome pairs undergo independent assortment at metaphase I.
Assuming no crossing over occurs, how many genetically unique combinations of maternal and paternal chromosomes are possible in the resulting gametes?
181818
818181
512512512
262,144262,144262,144
97 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.