Do you have a "beauty secret"? A person's V-shaped hair tip is a V-shaped hair tip with a downward protruding hairline in the middle of the forehead, commonly known as a beautiful tip (as shown in Fig

Do you have a "beauty secret"? A person's V-shaped hair tip is a V-shaped hair tip with a downward protruding hairline in the middle of the forehead, commonly known as a beautiful tip (as shown in Figure A). (1) People's V-shaped hair tips and flat hair tips are different manifestations of the same trait, and they are a pair of relative traits. If the V-shaped hair tip is recessive, then the flat hair tip is dominant. A couple with recessive traits will not have children with dominant traits; This is inconsistent with the facts, indicating that V-shaped hair tip is a dominant trait.

(2) The child's hair is flat and pointed, and the genetic component is AA; Children's paired genes come from father and mother respectively, indicating that both parents have recessive gene A; Parents present V-shaped hair tips, indicating that parents also carry dominant gene A; That is, the genetic composition of the father is Aa, and the genetic composition of the child is AA.

(3) The genetic map of this couple is as follows:

When a parent's genome becomes Aa, a newborn child will show a V-shaped hair tip. There are two possibilities for the genetic makeup of this child: AA or AA; The probability of the couple giving birth to a flat-haired baby is 1 4, while the probability of giving birth to a daughter is 1 2, so the probability of giving birth to a daughter with flat hair is 1 4 × 1 2 = 1 8.

So the answer is:

(1) relative character; superiority

(2)Aa； alcoholic anonymous

(3)AA； aa； 1 8