Category: R

In genetics, a second cross involving the same strains but carried by sexes opposite to those of the first cross.  

Altruism that is based on the expectation that today’s giver will be tomorrow’s taker, kin-selection hypothesis; alarm call.  

The relapse or recurrence of a disease. Habitual criminality; the repetition of antisocial acts.  

A unit of heredity that is contrasted to the dominant gene. Member of a pair of genes (an allele) that cannot express itself in the presence of its more dominant allele; it is expressed only in the homozygous state. For example, the gene for blue eyes is recessive and will not manifest itself if the…

The theory that a drug exerts its effect on certain parts of the body because specific receptor cells receive only certain body chemicals or drug molecules that structurally resemble them.  

Difficulty in understanding what others say.  

The retinal area in which visual stimulation affects a particular cell’s firing rate.  

In free recall, the recall superiority of the items at the end of the list compared to those in the middle of the list.  

The now discredited view that in embryological development each organism goes through the evolutionary history of the species of which it is a member. The theory that during development an individual organism goes through the same progressive stages as did the species in developing from the lower to the higher forms of life; the theory…

A person who is obstinate in defying authority. Not responding to treatment.