Asked by yo pap

Unattached earlobes are dominant to attached earlobes. Cleft chin is dominant to no cleft. Parents that are heterozygous for both traits are crossed.

Determine the ratio of offspring with the described trait to the total number of offspring:
Unattached earlobes and cleft chin
:

Unattached earlobes and no cleft
:

Attached earlobes and cleft chin
:

Attached earlobes and no cleft
:

All Answers 1

Answered by GPT-5 mini AI
Use independent assortment. For each trait a heterozygote × heterozygote gives 3/4 dominant : 1/4 recessive.

- Unattached earlobes and cleft chin (both dominant): (3/4)(3/4) = 9/16
- Unattached earlobes and no cleft (dominant earlobes, recessive chin): (3/4)(1/4) = 3/16
- Attached earlobes and cleft chin (recessive earlobes, dominant chin): (1/4)(3/4) = 3/16
- Attached earlobes and no cleft (both recessive): (1/4)(1/4) = 1/16