As a group, halogens exhibit highly variable physical properties. Halogens range from solid (I2) to liquid (Br2) to gaseous (F2 and Cl2) at room temperature. The chemical properties are more uniform. The halogens have very high electronegativities.Fluorine has the highest electronegativity of all elements.alogens range from solid (I2) to liquid (Br2) to gaseous (F2 and Cl2) at room temperature. The chemical properties are more uniform. The halogens have very high electronegativities. Fluorine has the highest electronegativity of all elements.
A gene can exist in many different forms, calledalleles. For example, letâs say that there is one gene which determines the color of your hair. That one gene may have many forms, or alleles: black hair, brown hair, auburn hair, red hair, blond hair, etc. You inherit one allele for each gene from your mother and one from your father. Each of the two alleles you inherit for a gene each may be strong (dominant) or weak (recessive).
Eye color is generally determined by the amount of pigment in the eye and this is decided by our genetic makeup long before we are born!! There are several genes which influence the color of a person's eyes.As a general rule brown eyed genes are often dominant and blue eyed genes tend to be recessive.ye color is generally determined by the amount of pigment in the eye and this is decided by our genetic makeup long before we are born!! There are several genes which influence the color of a person's eyes.