Answer:
a. 1/2 b. The organism is an animal
Explanation:
a. What is the medullary index for an organism that has a medulla width of 2cm and hair shaft width 4cm?
Medullary index = diameter of medulla/diameter of hair.
Given that diameter of medulla = medulla width = 2cm and diameter of hair = hair shaft width = 4cm, 
Medullary index = diameter of medulla/diameter of hair = 2 cm/4cm = 1/2
b. Is this organism human or animal?
Since the medullary index = 1/2 > 1/3 (if it is ≤ 1/3 it is human hair and ≥ 1/2 it is animal hair), it is animal hair. So, the organism is an animal. 
 
        
             
        
        
        
After you wash your hands with soap and water, it should be acceptable. 
 
        
             
        
        
        
Brainliest???
If the resulting daughter cells are too damaged to undertake further cell divisions, the mutation would not be propagated and no harm comes to the organism
 
        
        
        
The enzyme pepsin acts on proteins to produce peptides which are later broken into amino acids in the small intestine
        
             
        
        
        
Alleles are the alternative form of a gene that code for a given trait, the alleles may be dominant or recessive or exhibit incomplete dominance. When two alleles are similar they are referred to as homozygous while they are not similar they are referred to as heterozygous. Based on the founder effect, rare alleles and combinations may be improved in new populations because of the reduced size of the initial population.