Imagine you do dna fingerprinting in a forensics lab. you obtain six samples
from a crime scene and use them to make the dna fingerprints shown below.
which two samples are most likely to have come from the same person?

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).