the rate of migration of dna within an agarose gel in the gel electrophoresis technique is primarily based on what factor?

The image shows embryos of three vertebrate classes

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

Plz ! what does it mean for an allele to be dominant?