🧬 Topic Summary
Pedigree analysis is like reading a family tree, but for genes! 🌳 It's a way for scientists and students to track how certain traits, like eye color or genetic diseases, are inherited through generations. By looking at symbols and patterns on a pedigree chart, we can figure out if a trait is dominant or recessive, and even predict the chances of future family members inheriting it. It's a powerful tool for understanding genetics!
These charts use specific symbols: circles for females and squares for males. Shaded symbols indicate individuals expressing the trait in question. Lines connect family members, showing relationships and descent.
🔑 Part A: Vocabulary
Match the terms with their definitions:
| Term |
Definition |
| 1. Genotype |
A. A chart showing the inheritance of traits. |
| 2. Phenotype |
B. Having two different alleles for a trait. |
| 3. Pedigree |
C. The observable characteristics of an organism. |
| 4. Heterozygous |
D. The genetic makeup of an organism. |
| 5. Allele |
E. Different forms of a gene. |
(Answers: 1-D, 2-C, 3-A, 4-B, 5-E)
✍️ Part B: Fill in the Blanks
A pedigree chart uses __________ and __________ to represent males and females, respectively. Shaded symbols indicate individuals __________ the trait. Analyzing these patterns helps determine if a trait is __________ or __________.
(Answers: squares, circles, expressing, dominant, recessive)
🤔 Part C: Critical Thinking
Imagine you are a genetic counselor. A couple comes to you because they have a family history of a recessive genetic disorder. How would you use a pedigree chart to help them understand their risk of having a child with the disorder? Explain the steps you would take.