| Sex cells? | 10 |
| Russian name ending | 19 |
| Round gametes | 13 |
| Roman breakfast? | 16 |
| Roe, to Romans | 14 |
| Roe, to Cato | 12 |
| Results of oogenesis | 20 |
| Reproductive gametes | 20 |
| Reproduction term | 17 |
| Protein for Pliny | 17 |
| Plant gametes, e.g. | 19 |
| Places where it all began | 25 |
| Part of Brutus' breakfast? | 30 |
| Ovoid objects, to Romans | 24 |
| Ovid's eggs | 15 |
| Oospheres, say | 14 |
| Ooplasm containers | 18 |
| Oologists' studies | 22 |
| Oocytes, eventually | 19 |
| Oft-donated cells | 17 |
| Nero's eggs | 15 |
| Nero's breakfast order? | 27 |
| Necessities for pregnancies | 27 |
| Meiosis output | 14 |
| Maturation formations | 21 |
| Mammals-to-be | 13 |
| Macrogametes, e.g. | 18 |
| Largest human cells | 19 |
| Largest cells in the human body | 31 |
| Large gametes | 13 |
| Large cells | 11 |
| Lab cells | 9 |
| IVF supplies | 12 |
| IVF stuff | 9 |
| IVF stock | 9 |
| IVF extractions | 15 |
| Items ab gallinis | 17 |
| Ingredients of Ovid's omelet | 32 |
| Ingredients for Nero's omelet | 33 |
| Incipient chicks | 16 |
| In vitro needs | 14 |
| Halves of zygotes | 17 |
| Germs of life | 13 |
| Genetic lab materials | 21 |
| Gametes, for women | 18 |
| Gallina's largess | 21 |
| Gallina products | 16 |
| Future twins, perhaps | 21 |
| Future embryos, perhaps | 23 |
| Future aves? | 12 |
| Fraternal twins come from two different ones | 44 |
| Follicles have them | 19 |
| Fertilized things | 17 |
| Fertilized cells | 16 |
| Fertilizable gametes | 20 |
| Fertility-clinic topic | 22 |
| Fertility lab supply | 20 |
| Fertility clinic samples | 24 |
| Fertility clinic inventory | 26 |
| Fertility clinic deposits | 25 |
| Fertility bank stock | 20 |
| Female reproductive cells | 25 |
| Eventual "aves" | 25 |
| Embryo sources | 14 |
| Elliptical ornaments | 20 |
| Eggs, to Pliny | 14 |
| Eggs, to Nero | 13 |
| Eggs, to Lucullus | 17 |
| Eggs, to Livy | 13 |
| Eggs, to Cicero | 15 |
| Eggs, to Augustus | 17 |
| Eggs, to a fertility specialist | 31 |
| Eggs, in biology class | 22 |
| Eggs, in a biology lab | 22 |
| Eggs, fancily | 13 |
| Eggs received by a surrogate | 28 |
| Eggs of science | 15 |
| Eggs in old Rome | 16 |
| Eggs in fertility clinics | 25 |
| Eggs for Terence | 16 |
| Eggs for Nero | 13 |
| Eggs for Livy | 13 |
| Eggs for Horace | 15 |
| Eggs to Ovid | 13 |
| Eggs to Cato | 13 |
| Egg cells (which are broken 3 times in this puzzle) | 51 |
| Donations at some clinics | 25 |
| Donated eggs? | 13 |
| Dizygosity twosome | 18 |
| Dairy offerings: L. | 19 |
| Czech surname suffix | 20 |
| Certain ornaments in architecture | 33 |
| Certain gametes | 15 |
| Certain fertility clinic specimens | 34 |
| Cells covered in sex ed | 23 |
| Cells contributing to the need for a Lamaze class | 49 |
| Caviar, always | 14 |
| Cato's omelet material | 26 |
| Caesar's morning meal? | 26 |
| Caesar's breakfast? | 23 |