Protein tyrosine kinase that phosphorylates and inhibits cdk1 and acts as a regulator of meiosis in oocytes. Required to ensure the meiotic cell cycle in oocytes by phosphorylating cdk1 at 'Tyr-15', leading to inhibit cdk1 activity and prevent meiosis (By similarity). ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. WEE1 subfamily.