One is Drosophillia melanogaster, a common genetic workhorse and common fruit fly. It has only four chromosomes.
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All of the composite numbers less than 100 have factor pairs.
All quadrilaterals except parallelogramshave less than 2 pairs of parallel sides.
2 5 6
There are eight twin prime pairs less than 100 [(3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73)].
Autosomes come in pairs usually (one from the mother, and one from the father), but, sometimes, as in with genetic disorders, you might find things like trisomies, where you have 3 chromosomes for the same autosome, or monosomies, where you only have 1 instead of two.