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Science Explosion 14
BJU 6th Science - Chapter 13
| Question | Answer |
|---|---|
| Traits | characteristics |
| Genes | small pieces of DNA in chromosomes |
| DNA | chemical code that tells cells what to do |
| Heredity | passing of traits from parents to offspring |
| Inherited | received traits from parents |
| Purebred plant | plants that show the same trait for many generations when pollinated naturally |
| P generation | parent generation |
| Hybrid | plants produced by crossing purebred parents that each have different forms of the same trait |
| Dominant trait | characteristic shown in hybrid generation |
| Recessive trait | hidden in hybrid generation and can appear in later generations |
| Phenotype | physical appearance of an organism |
| Genotype | arrangement of genes in an organism |
| Codominant | both genes expressed |
| Incomplete dominance | blending of genes (red flower+white flower=pink flower) |
| Pedigree | "family tree" that traces a trait |
| Sex-linked trait | traits passed from mother to son (like colorblindeness) |
| Sickle cell anemia | disease with abnormal, sickle shaped red blood cells |
| Cystic Fibrosis | genetic disease affecting lungs and digestive system |
| Down syndrome | genetic disorder caused by extra chromosome |
| Genetic engineering | involves changing or tranfering genes from one organism to another |