DES MOINES — Parents of elementary school students would have to be notified and provide written permission if instruction related to gender identity were included in a curriculum offered in accordance with the state’s educational standards under a bill that cleared a Senate subcommittee Tuesday.Senate File 167 provides that a student in first through sixth grades may opt out of instruction related to gender identity if a public or nonpublic accredited school does not obtain written permission from the pupil’s parent or legal guardian.