Many geologic periods were defined by events that made a natural boundary to the period. Often times what were these defining events ?

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of

What is the role of dna ligase in the elongation of the lagging strand during dna replication?

What does it mean for an allele to be dominant?