In a cladogeam when does a group of organisms branch off

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

All eukaryotic cells contain small bodies called

Across of blue x blue (both heterozygous) would result in