In ancient Greece, a mutation arose that resulted in some sheep with Golden Fleece compared to the regular white fleece. However, it was discovered that true-breeding golden-fleeced sheep were impossible to obtain.
- What does it mean by true breeding? (2 marks)
- What is required for a line to become true breeding? (2 marks)
- Propose a genetic reason (hypothesis) why true-breeding golden fleeced sheep may not be possible. Include in your answer symbols to indicate how the phenotypes are related to genotypes. (4 marks)
- What phenotypic ratio would you expect in the progeny if you crossed two sheep both having golden fleece, using your hypothesis? (4 marks)