Under which of the following circumstances would the allele frequencies of two populations be very different?

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 which of the following relationships is one organism always benefited while the other organism is always harmed

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a