Chiral chromosomes.
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pentagon
pentagon pentagon
equal, the same as, mathmatically similar, exactly the same as each other etc. The technical term for figures of identical size and shape is "isomorphic".
Yes, it's possible for a mutation in the chromosome to produce otherwise-identical twins with opposite genders. But generally no, identical twins have the same gender. (but fraternal twins have different genders just as often as any siblings)
the two polygons are congruent if they are the same shape with the same measurements. If they can be flipped, rotated, and/or slid to look identical then they're congruent.