A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).
At night, humans can use flashlights to spot animals that possess tapetum lucida by causing a phenomenon called eye shine.. Eye shine is the iridescent glow observed in animals when light is shone into their eyes, which floods the eye with light that is then reflected by the tapetum lucidum.
The eyes and love are connected. A dimly lit room casts a romantic spell by allowing for intimacy and also the darkness can cause your pupils to enlarge which is sometimes a sign of excitement, attraction and love. As revealed in Part 1 of this series, mutual eye contact can fan the flames of love between two people.