In the case of genetic investigation, scientists used fruit flies as their model organism since they share 75% of the genes that cause disease with humans.  Fruit flies are also great to work in a research setting because they are relatively easy to take care of, especially compared to larger and more expensive organisms like rats or fish.Answer:
Explanation:
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Answer:
1. Segregation, one, 50%.
2. Punnett Square, A Punnett square allows the prediction of the percentages of phenotypes in the offspring of a cross from known genotypes (shows the probability of an offspring with a given genotype resulting from a cross), It does not show actual offspring.
Explanation: 
Punnett Square, this gives you the total number of predicted offspring. 
If my answer is perfect considered as brilliant 
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Answer:
The correct answer is -
1. right-handed
2. right-handed
3. positive
4. left-handed
5. negative
6. negative
Explanation:
In a circular bacterial chromosome, the structure of DNA is a right-handed double helix In a circular bacterial chromosome.
If DNA is twisted in the right-handed direction, it becomes overwound. Overwinding results in positive supercoiling takes place. If DNA is twisted in the left handd direction, it becomes underwound. Underwinding results in negative supercoiling.
f. One effect  negative supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix
 
        
             
        
        
        
Answer:
loam
i am not 100% sure but logically it's loam