Two pairs of chromatids lying side by side are referred to as a tetrad.
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The point of attatchment between two chromatids is called the centromere. When two chromatids are connected, it is called a chromosome which is essential in DNA replication, or, mitosis.
Trapezoids have only one pair of parallel sides. A parallelogram has two pair of parallel sides.
A trapezoid has one pair of parallel side and can have two adjacent angles that are right.
centromere
They have two pairs of sides that are parallel. Trapeziums have exactly one pair of sides that are parallel.