Assertion: platypus's gene | /r/HasProperty | required
Facets:
Source sentences:
text: The genes that produce the tortie pattern are located on the X chromosome, and two genes are required (the red tabby gene on one X and the black gene on the other).
text: The genes that produce the tortie pattern are located on the X chromosome, and two genes are required (the red tabby gene on one X and the black gene on the other).