In a species, a body cell contains 18 chromosomes and a normal gamete contains 9 chromosomes. One egg cell contains 18 chromosomes. It is fertilised by a normal sperm cell.
Calculate the number of chromosomes in the zygote and explain how this compares with the number in a zygote formed from two normal gametes.
92 exam-style questions on Edexcel GCSE Biology 3.1 Reproduction and meiosis, covering 3.1.1 Advantages and disadvantages of reproduction and 3.1.2 Role of meiotic cell division. Each one has a worked solution and a mark scheme showing where the marks go.