| A | B |
|---|
| cell | The smallest unit of life that is able to reproduce itself. |
| sperm | The male sex cell. |
| ovum | The female sex cell. AKA The egg |
| conception | The union of the ovum and sperm. |
| zygote | The single cell formed at conception; AKA Fertilized Egg |
| fallopian tubes | Two hollow tubes that connect to the uterus and have fingerlike projections that reach toward each ovary. |
| uterus | The organ in which the baby develops and is protected until birth. |
| genetic factors | Traits that are passed through the genes. |
| chromosomes | Threadlike structures that carry genes in living cells. |
| dominant traits | Traits that always show in a person even if only one gene of the pair is inherited for that trait. |
| recessive traits | Traits that typically do not show in a person unless both genes for the trait are inherited. |
| fraternal | Term describing children from multiple pregnancies who develop from two ova and differ in genetic makeup. |
| chorion | Menbrane that surrounds the baby in the uterus. |
| identical | Term describing children from multiple pregnancies who develop from one fertilized ovum and have the same genetic makeup. |
| prenatal development | The development that takes place between conception and birth. |
| germinal stage | The first stage of prenatal development, which lasts about two weeks after conception. |
| amnion | A fluid-filled sac that surrounds the baby in the uterus. |
| placenta | An organ filled with blood vessels that nourishes the baby in the uterus. |
| umbilical cord | The cord that connects the baby to the placenta. |
| embryonic stage | The second stage of prenatal development, which lasts about six weeks. |
| cartilage | Soft, elastic, flexible tissue that provides structure for the body. |
| fetal stage | The third stage of pregnancy, lasting from about nine weeks after conception until birth. |
| fetus | Term used to describe a baby in the fetal stage of development. |
| quickening | Movements of the fetus that can be felt by the mother. |
| age of viability | The age at which most babies could survive if they were born. 28th week of pregnancy. |
| womb | Another name for the uterus. |
| XX | Chromosome combination for a girl. |
| XY | Chromosome Combination for a boy. |
| gene | Carries traits which are inherited. |
