The HY4 gene was later renamed as:
C fits best: CRY1. Keep the cryptochrome basics straight and CRY1 stands out as the precise answer. Avoid: A) CRY2; B) CRY3; D) PHYA. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
