Answer:
There's not enough information to answer this. You need to provide the information on the people.
 
        
             
        
        
        
Answer:
 i think it's the double helix
Explanation:
 
        
                    
             
        
        
        
The answer you have been looking for is “visual”
        
             
        
        
        
Answer:
47 
Explanation:
We all know that gametes like egg cell and sperm have haploid set of chromosomes but here as per this question she has produced 2 copies of chromosome 21. For the sake of maintaining haploidy, she was supposed to have only a single copy of chromosome 21 as a result of which her egg cell was supposed to have 23 chromosomes not 24. 
But, this is a case of non dis-junction. Also, in a normal sperm there are no such copies of any chromosome i.e. there is a haploid set of chromosomes. It means that sperm must be having only 23 chromosomes. So we can easily infer that when the egg cell and sperm will fuse, the zygote will have 47 chromosomes (24 from egg cell and 23 from sperm).  
 
        
             
        
        
        
Option - IT IS BASED ON PREDICTION 
because they have not had any way of telling where or when it has happened or occurred so you must predict how it happens or works.
hope this helps