Answer;
a segment of chromosomal DNA
Explanation;
A gene is a  hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism. Genes undergo mutation when their DNA sequence changes.
It is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins.  However, many genes do not code for proteins.
Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each person’s unique physical features.
 
        
                    
             
        
        
        
Answer:
<em>The offspring which carries the allele II will be homozygous dominant.</em>
Explanation:
A dominant trait can be described as a trait which masks the effect of a recessive trait. A recessive trait can be described as a trait which gets masked by the dominant trait. 
A homozygous dominant trait occurs when both the alleles for the gen are dominant. A heterozygous dominant trait occurs when one allele is dominant and the other is recessive for the trait.  
Hence, a homozygous dominant trait will carry the alleles II.
 
        
             
        
        
        
Answer: living and fossil organisms evolved
Explanation:
 
        
             
        
        
        
Industrial waste! This is because the waste is in direct contact with the soil in the form of chemicals or even heat!
        
                    
             
        
        
        
Density-dependent limiting factors cause a population's per capita growth rate to change—typically, to drop—with increasing population density