A scientist studies sexual reproduction in a species of gecko. Each body cell of a newly hatched gecko contains 38 chromosomes.
The table shows four possible records of chromosome numbers during reproduction.
| Record | Chromosomes in an egg cell | Chromosomes in a sperm cell | Chromosomes in the cell formed at fertilisation |
|---|---|---|---|
| R | 19 | 19 | 38 |
| S | 38 | 38 | 76 |
| T | 19 | 19 | 19 |
| U | 38 | 38 | 38 |
Which record is consistent with the hatchlings having 38 chromosomes in each body cell?
Record R
Record S
Record T
Record U
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.