Answer:Tay-Sachs is an autosomal recessive disease caused by mutations in both alleles of a gene (HEXA) on chromosome 15. HEXA codes for the alpha subunit of the enzyme β-hexosaminidase A. This enzyme is found in lysosomes, organelles that break down large molecules for recycling by the cell.
Explanation:
 
        
             
        
        
        
Answer:Hello My name is Marissa and im here to help!
Preservatives are natural or man-made chemicals that are added to foods to stop them from spoiling.
Explanation:hope this helps! brainliesst?
 
        
             
        
        
        
Around 40 weeks is when it occurs
        
             
        
        
        
Answer:
Population.
Explanation:
Population may be defined as the smallest unit of ecology and the evolution might occur at the population level. 
Population is the group of the organisms that belong to the particular species and lives in a specific particular habitat. The individual of the population breeds among themselves. Sometimes the individual of two different population can also breed among themselves in extreme cases.
Thus, the answer is population.