We have a lot of interruptions during the school day, including having an assembly that makes you lose one class but not that other. Recently I had that situation and was annoyed about that. So I screencast (recorded a voice over while going through my powerpoint) two recordings.
Different alleles produce variation in inherited characteristics such as hair colour or blood type. In an individual, one form of the allele (the dominant form) may be expressed more than another form (the recessive form). Continue reading