Hello guys, Welcome to Africa's Largest Video Search Engine, and you are watching GCSE Biology - DNA Part 2 - Alleles / Dominant / Heterozygous / Phenotypes and more! #64. and this video is uploaded by Cognito at 2019-01-07T05:26:20-08:00. We are just promoting this video only for entertainment and educational purpose only. I hop you like our Video Search Engine. [zNEtVaNQ0s8]