Learn how traits are passed from generation to generation. Punnett Squares help predict the genes passed to offspring. Dominant and recessive genes combined from parents make you look the way you do.
Some suggestions, referring to dominant and recessive genes is misleading, the forms of a gene are called alleles (these can be dominant, recessive, codominant, etc). Also, in heterozygotes, the convention is to always put the dominant allele first (Bb, not bB). Then, it is easier for students to see is multiple combinations are the same or different. I've been teaching genetics for years... misconceptions, sloppy vocab develops easily.
It is a great video but my school sends me math and other science video's and I keep having to dislike them bc I don't want them to show up in my recommends.
Dominant basically means that it will always take over recessive. In a punnett square, you only need one dominant(for example a capital T), you need Tt or TT in order for the kid to get the dominant trait. For recessive, you need two smaller case T's.
Conventionally the dominant allele will be a capital letter and the recessive will be lower case (i.e. B vs b). If you are given a word problem, it should specify one trait as dominant and one as recessive, and then you assign letters. Does that make sense?
