Terms : Hide Images
| 128803742 | Identical twins | develop from the same fertilized egg (monozygotic) and therefore have the same genes | |
| 128803743 | fraternal twins | develop from two eggs(dizygotic) fertilized by two different sperm | |
| 128803744 | Chromosomes | a strand of hereditary material found in the nucleus of a cell | |
| 128803745 | sex limited | a gene that affects one sex more strongly than the other, even though both sexes have the gene | |
| 128803746 | sex chromosomes | determine if an individual will develop as a male or female | |
| 128803747 | x chromosome | females have two per cell and males only have one | |
| 128803748 | Y chromosome | males have one per cell and females have none | |
| 128803749 | sex-linked | a gene located on the x chromosome | |
| 128803750 | heritability | an estimate of the variance within a population that is due to heredity | |
| 128803751 | Phenylketonuria (PKU) | an inherited disorder in which a person lacks the chemical reactions that convert a nutrient called phenylalanine into other chemicals; unless their diet is controlled the person will become mentally retarded | |
| 128803752 | zygote | a fertilized egg cell | |
| 128803753 | fetus | an organism more developed than the embryo but not yet born (from about 8 weeks after conception until birth in humans) | |
| 128803754 | fetal alcohol syndrome | a condition marked by stunted growth of the head and body; malformations of the face heart and ears; and nervous system damage, including seizures, hyperactivity, learning disabilities and mental retardation | |
| 128803755 | habituation | a decrease in a person's response to a stimulus after it has been presented repeatedly | |
| 128803756 | dishabituation | an increase in the previously habituated response as a result of a change in the stimulus |
