Answer:a u have both ur parents genes Dd and Dd
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Crossing over is a biological occurrence that happens during meiosis when the paired homologs, or chromosomes of the same type, are lined up. Hope this helps :)
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I think it's electric force. Not 100% sure but I hope it's right.
        
             
        
        
        
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The Loop of Henle serves to create a concentration gradient throughout the nephron which helps increase the reabsorption of water and certain ions. In the thin descending limb, water is very permeable and is reabsorbed due to the existing concentration gradient in the medulla.