How come the human body is so symmetrically arranged around a central axis (the spine), the left part mirroring the right part? - just like a Rorschach inkblot on a paper folded in two. Even fruits are symmetrical around a central focal point or axis.
2006-12-05 00:22:01 · 4 answers · asked by AskAsk 5 in Science & Mathematics ➔ Biology
It starts from one fairly symmetrical fertilized egg. Cell division is binary, two identical 'daughter' cells derive from each cell division. At the two, 4, 8, 16 cell stages we have perfect 2-fold symmetry. Two-fold symmetry is the simple consequence of the binary nature of cell division. Generation of the polarity (asymmetries) head to foot, front to back and internally and all the specialized organs and structures require additional special developmental mechanisms.
2006-12-05 02:39:19 · answer #1 · answered by surfnscience 2 · 1⤊ 0⤋
Why should they be? If you look at anything around you that is not created by man, you will see that there is no such thing as natural "true" symmetry. To answer your question from a biologists point of view, look to your genetic code. They are not always perfectly aligned during transcription and translation during nuclear division (mitosis and meiosis). The DNA lines may be nearly perfect, but that is why the human body is nearly symmetrical.
2016-03-13 03:38:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Because in this atmosphere and gravity field it provides the most stable and mobile form of movement to better allow for defence and food gathering
2006-12-05 00:57:55 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Better balance.
2006-12-05 00:30:53 · answer #4 · answered by ? 4 · 0⤊ 0⤋