In a species, diploid body cells contain 18 chromosomes. Suppose reproductive cells were made by mitosis instead of meiosis. Assume that two reproductive cells fuse at fertilisation and that the resulting zygotes grow by mitosis.
Calculate the number of chromosomes in the first zygote formed. Explain what would happen to the chromosome number in the zygote of the next generation if the same process continued.
186 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.