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olga2289 [7]
3 years ago
15

Why is the structure of dna called a double helix?

Biology
1 answer:
jeka57 [31]3 years ago
4 0
The structure of DNA is called a double helix because DNA is made up of two strands of nucleotides wound together in a spiral. 

DNA has two strands that run opposite of each other and twist together much like a twisted ladder. Each backbone of the ladder is made up of alternating groups of sugar and phosphate groups.  
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Despite the fact that both parents are still blood type A, Dad has the option of passing either the A or the O gene variant.

Mom can also transmit either an A or an O. As a result, you can see that a child has a 1 in 4 probability, or 25% chance, of having blood type O. However, it is theoretically feasible for two O-type parents to have an AB or B blood type child (although this is even more unlikely). In fact, if you take into account the rule-breaking cases, a child can acquire practically any blood type. Having an A parent and a B parent can result in a child with the blood types A, B, AB, or O.

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1 year ago
According to this evolutionary tree, the archaea and eukaryotes last shared a common ancestor ________.
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Answer:

2.5 billion years ago.

Explanation:

Evolutionary tree is constructed to understand the phylogeny and evolution relationship of the organism. The evolutionary tree is constructed by looking at the molecular and physiology of the different organisms.

The eukaryotes are more closely related to the archaea. Depending on the biochamical and molecular evidence is has been found that they share the common ancestor almost 2.5 billion years ago. This can also be deduced by the fossil evidence as well.

Thus, the answer is 2.5 billion years ago.  

5 0
3 years ago
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