Well, one of the polynucleotides must move upwards and vice-versa.
DNA is Deoxyribonucleic Acid. The name is simple to remember - Deoxy, meaning its nucleotide (I.e. its monomer, and again I.e. the thing that composes it) doesn’t contain oxygen, unlike RNA (Ribonucleic Acid), which contains oxygen and has overall different functions than DNA.
Two polynucleotides in DNA connect to each other via hydrogen. This hydrogen connects something called “Nitrogen bases” - usually these connections are portrayed something like those pills with two colors on pictures.
Now I must also mention that in each nucleotide, apart from that nitrogen base and pentose (the two pentoses are ribose and deoxyribose, which is pretty simple), they also have a phosphoric acid connected to the fifth carbon atom in the pentose. This acid, which can be called a phosphoric remain as well, connects with another nucleotide’s OH end (hydroxide end), so you would get something like this:
So in DNA, the first polynucleotide points “downwards” with its OH end, and the second one “upwards” with its OH end. So yes, it should make sense if chickens moved in the opposite directions.
So why did I explain all this? Fun facts and something simple you can learn and do some research about really,
it’s not like we learn this in even greater detail at school.