One study found that the short allele of the serotonin transporter promoter gene (5-httlpr) contributes to increased rates of depression in all girls, but only in boys who:

Your answer is: come from low-SES backgrounds.

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.