| A | B |
|---|
| Asexual reproduction | Only one parent; offspring are identical |
| Sexual reproduction | Two parents; Allows for variation |
| Egg | Female gamete; made by meiosis |
| Sperm | male gamete; made by meiosis |
| Selective Breeding | Choosing which parents will mate to obtain desired characteristics |
| Gamete | sperm or egg cell |
| Cloning | Taking nucleus from a body cell and replacing in an egg cell with no nucleus |
| Differentiation | Specialization of cells; takes place soon after fertilization |
| Embryo | First two months of development |
| Estrogen | Female sex hormone |
| Fetus | Baby after two months |
| Mitosis | Asexual reproduction; Maintains chromosome number |
| Meiosis | Half the number of chromosomes are made; Makes sperm and egg |
| Ovaries | Female gonads; make homone estrogen and progesterone |
| Testes | Male gonads; Make hormone testosterone |
| Placenta | Where fetus and mother exchange nutrients and wastes |
| Uterus | Where the baby develops in mammals |
| Zygote | Fertilized egg |
| Negative feedback | The production of one hormone causes a decrease in the production of another |
| Ovulation | The release of the egg from the ovary |
| Fallopian tubes | Where fertilization occurs |
| Implantation | Embryo eats away and embeds itself into the wall of the uterus |
