How might a geneticist write alleles to show that a tall pea plant has one allele for tall stems and one allele for short stems?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?