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| 8703004704 | human development | the scientific study of the changes that occur in people as they age from conception until death. | 0 | |
| 8703004705 | longitudinal design | R esearch design in which one participant or group of participants is studied over a long period of time | 1 | |
| 8703004706 | Cross-sectional design | - research design in which several different age groups of participants are studied at one particular point in time. | 2 | |
| 8703004707 | Cross-sequential design | - research design in which participants are first studied by means of a cross-sectional design but also followed and assessed for a period of no more than six years. | 3 | |
| 8703004708 | DNA | ) - special molecule that contains the genetic material of the organism. | 4 | |
| 8703004709 | Gene | - section of DNA having the same arrangement of chemical elements. • | 5 | |
| 8703004710 | Dominant | - referring to a gene that actively controls the expression of a trait. • | 6 | |
| 8703004711 | Recessive | - referring to a gene that only influences the expression of a trait when paired with an identical gene! | 7 | |
| 8703004712 | Chromosome( 23pairs= 46 chromosomes in each cell | )- tightly wound strand of genetic material or DNA. Last pair determines sex. | 8 | |
| 8703004713 | Down syndrome ( | extra chromosome in 21 pair), | 9 | |
| 8703004714 | Klinefelter's syndrome | (extra 23rd- result: male with reduced masculinity), and | 10 | |
| 8703004715 | ( 23 pair missing X, results: short, infertile females | Turner's syndrome | 11 | |
| 8703004716 | Genetic disorder Tay-Sachs disease( | neurological disorder: destroys nerve cells in the brain and spinal cord) | 12 | |
| 8703004717 | genetic disorder sickle cell anemia() | disease of the respiratory and digestive tracts | 13 | |
| 8703004718 | Conception -. | the moment at which a female becomes pregnant | 14 | |
| 8703004719 | Fertilization - | the union of the ovum and sperm. | 15 | |
| 8703004720 | Ovum | - the female sex cell, or egg. | 16 | |
| 8703004721 | Zygote - | cell resulting from the uniting of the ovum and sperm; divides into many cells, eventually forming the baby. | 17 | |
| 8703004722 | Monozygotic twins - | identical twins formed when one zygote splits into two separate masses of cells, | 18 | |
| 8703004723 | Dizygotic twins | - often called fraternal twins, occurring when two eggs each get fertilized by two different sperm, resulting in two zygotes in the uterus | 19 | |
| 8703004724 | first two weeks after fertilization, during which the zygote moves down to the uterus and begins to implant in the lining embryo to the uterus. Placenta( nourishment and filters waste products) and umbilical cord are forming. Cells differentiate, stem cells | What happens during Germinal period - | 20 | |
| 8703004725 | the period from two to eight weeks after fertilization, during which the major organs and structures of the organism develop. Cells continue to specialize and become various organs. At the end of 8 weeks the embryo has primitive eyes, nose, lips, teeth, little arms and legs, beating heart. | What happens during Embryonic period - | 21 | |
| 8703004726 | Critical periods - | times during which certain environmental influences can have an impact on the development of the infant. | 22 | |
| 8703004727 | Teratogen - | any factor that can cause a birth defect | 23 | |
| 8703004728 | The placenta | sends nutrients from the mother to the fetus, carries away wastes, and screens out many potentially harmful substances. | 24 | |
| 8703004729 | Fetal period - | the time from about eight weeks after conception until the birth of the child. | 25 | |
| 8703004730 | Fetus | - name for the developing organism from eight weeks after fertilization to the birth of the baby. Huge growth, size increases by about 20 times, weight to 7 pounds. Organs become functional. At this moment teratogens will affect the nervous system, eyes , sexual organs; physical functioning of the organs rather than the structure. | 26 |
