SciShow
Having Six Fingers Is a Dominant Trait
Genetics are extremely complicated—so complicated that having an extra finger or toe, for example, is exceedingly rare despite it being caused by a dominant gene.
Curated Video
GCSE Biology - Why We Inherit Diseases From Our Family - Polydactyly & Cystic Fibrosis #75
In this video we take a look at the conditions polydactyly and cystic fibrosis, and use genetic diagrams to see how they can be inherited.
FuseSchool
Inherited Genetic Disorders
This girl has six fingers on her left hand. She has a condition called polydactyly, which causes extra fingers or toes. Her father and grandmother as well as some of her cousins also have the condition. This should give you a clue about...