https://diler.tube/videos/watch/f350e4df-f740-458a-9c25-e0b3227f9781 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 how she came to have it... any ideas? Well, polydactyly is an example of a genetic disorder - it is inherited. You inherit genes from your parents, and you have two copies of each gene - one from your mother and one from your father. Genes come in different forms, called alleles. Alleles may be recessive or dominant. Polydactyly is caused by a dominant allele, shown as a capital P. You only have to have one copy of this allele to have the condition. So in an example the father has a copy of this allele, but the mother does not… we can show this using a genetic diagram: Offspring with one dominant allele big P, and one recessive allele little p will also have the condition. Whereas these offspring won’t have the condition. Can you see what their genotype must be...? Sat, 14 Nov 2026 00:46:12 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://diler.tube https://diler.tube/lazy-static/avatars/f58b270a-6076-478a-ad43-3888a532ecb4.png https://diler.tube/videos/watch/f350e4df-f740-458a-9c25-e0b3227f9781 All rights reserved, unless otherwise specified in the terms specified at https://diler.tube/about and potential licenses granted by each content's rightholder.