Answer: A PEDIGREE is a family-tree like representation of how organisms are related based on ANCESTRY. It shows genetic relatedness or blood relationship between individuals or organisms. 
Explanation: Pedigree can be used to determine 
1. Family history or genealogy. 
2. Genetic or blood relationship. 
3. Coefficient of relationship. 
4. Degree of relationship.
5. Proportions of shared genes. 
6. Mode of transmission of diseases.
7. Risk evaluation or determination. 
Genetic counseling. 
8. Linkage analysis. 
Pedigree symbols are used in constructing pedigree. 
 
        
             
        
        
        
The building blocks of proteins is Amino acids and nucleic acids is Nucleotides
        
             
        
        
        
Gates function in a similar way as cell membrane :
cell membrane seperate the external enivironment from the cell while gate even seperate the external environment from the house
cell membrane controls the exit and entry of the cell, gate controls the entry and exit of the house