If variation in species were solely a result of genetic recombination during sexual reproduction, how would that limit the evolution of that species?

Dwarf galaxies are select one: a. relatively rare. b. not very bright c. mostly spiral shaped. d. none of these.

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?

I’m stuck on this question cuz i’m stupid sksksksk