| Unit 3: Biology | |||
2. What is the difference between a dominant and a recessive gene? 3. A dominant gene for a specific trait is inherited along with a non-dominant gene for the same trait. Which gene’s “building instructions” will be used to assemble the specific protein? 4. In guinea pigs black coat is dominant to white. Is it possible for a black guinea pig to give birth to a white guinea pig? Explain your answer. 5. Explain how both heredity and environment contribute to the expression of a trait in plants. 6. Review your observations from the activity. Comment on the following statement: heredity can determine what an organism may become, not what it will become. 7. Can the environment change the development of an inherited characteristic? Use your observations from this activity to justify your answer. |
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| Inquiring Further | |||
| 1. Analyzing a genetic condition What is a genetic condition? Choose a condition from one of the more well-known conditions, such as achondroplasia, cystic fibrosis, hemophilia, Huntington’s chorea, Marfan syndrome, dwarfism, Down syndrome, Fragile-X syndrome, Tay-Sachs disease, sickle cell anemia, neurofibromatosis, etc. You may wish to investigate a condition with which you are personally familiar. Construct a hypothetical family tree to do a pedigree analysis of the condition. (A pedigree is used to trace inheritance of a trait over several generations.) |
 Down syndrome is caused by abnormal cell division in the egg, sperm, or fertilized egg. This results in an extra or irregular chromosome in some or all of the body’s cells. |
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