Question

in humans, a cleft chin is dominant and no - cleft is recessive. what will the generations look like? assume that mendels method of crossing two true breeding parents with opposite traits is followed. check all that apply. the p generation, f1 generation, and f2 generation will have all cleft chins. the p generation, f1 generation, and f2 generation will have all no - cleft chins. the p generation and f1 generation will have all cleft chins. the f1 generation will have all cleft chins. the p generation and f2 generation will have all no - cleft chins. the p generation and f2 generation will have cleft chins and no - cleft chins. the p generation, f1 generation, and f2 generation will have cleft chins and no - cleft chins.

Explanation:

Let's assume the dominant allele for cleft - chin is C and the recessive allele for no - cleft is c. The true - breeding parents are CC (cleft - chin) and cc (no - cleft). The P generation has parents with opposite traits. When CC and cc are crossed (P generation), all offspring in the F1 generation will be Cc (cleft - chin because the dominant allele C is present). When F1 generation (Cc) individuals are self - crossed, the F2 generation will have a ratio of 3 cleft - chin (CC or Cc) : 1 no - cleft (cc). So the P generation has parents with different traits (cleft and no - cleft), the F1 generation has all cleft - chin, and the F2 generation has both cleft and no - cleft chins.

Answer:

The F1 generation will have all cleft chins.
The P generation and F2 generation will have cleft chins and no - cleft chins.