What shape does the dna molecule have?

What does it mean for a cell membrane to be selectively permable

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?

Whats one way that rocks do not follow the typical rock cycle pathway?