Assertion: boa constrictor | /r/HasAspect | either zz chromosomes
Facets:
value: for males or zw for females
type: OTHER
value: for zw
type: TRANSITIVE-OBJECT
Source sentences:
text: A boa constrictor has either ZZ chromosomes for males or ZW for females, so it is the female gene that makes the difference as far as determining gender goes.