A diploid cell containing 40 chromosomes produces gametes by meiosis. One of these gametes fuses with a normal gamete from the same species.
Which sequence gives the chromosome numbers in the starting cell, gamete and zygote?
40, 10, 20
40, 40, 80
40, 20, 20
40, 20, 40
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.