Assertion: chromosome's pair | /r/MadeOf | two x chromosomes
Facets:
Source sentences:
text: The sex chromosomes are of two types, which are designated X and Y, and the pair of sex chromosomes may consist of two X chromosomes or of an X and Y paired together.
text: Every human who has undergone typical embryonic development has 23 pairs of chromosomes, including a pair of sex chromosomes; every pair of sex chromosomes consists of either two X chromosomes or one X and one Y chromosome.