Common Mistakes with Multiple Alleles - and How to Avoid Them!

Spoiler: multiple alleles aren't special - you work problems (like Punnett squares) with multiple alleles the same way you'd work them for a gene with just two alleles. You just get more possibilities for genotypes and phenotypes!

In this video, we look at three common issues students often run into with multiple alleles:

00:00 Intro
00:20 NOTATION: multiple alleles are often written with a superscript, but we can also use superscript to label alleles in other scenarios - always read your question carefully!
01:02 The ABO blood group has three alleles, represented by the letter I with superscript; A and B are codominant, and both dominant over O.
02:14 GENOTYPES AND PLOIDY: you only get as many alleles as your ploidy allows! regardless of the number of alleles in your population, you only get two alleles in a diploid genotype (it could be two copies of the same allele, or two different alleles).
02:55 MULTIPLE ALLELES ARE COMMON: just because Mendel didn't want to study them doesn't mean they aren't everywhere :)
03:30 RECAP!

Remember, ABO is the name of the group, it's not a genotype!

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