Question

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 genotype of the following offspring. 1 2 3 4 5

Explanation:

Step1: Determine the alleles for each parent

Parents are heterozygous for both traits. So, for earlobes (E - unattached, e - attached) and chin (A - cleft, a - no cleft), the parents' genotype is EeAa. When forming gametes, they can produce EA, Ea, eA, ea.

Step2: Analyze the Punnett square

• For position 1: The row is EA and the column is eA. Using the rules of Mendelian genetics (combining alleles from each parent), the genotype is EeAA.
• For position 2: The row is Ea and the column is EA. The genotype is EEAa.
• For position 3: The row is Ea and the column is Ea. The genotype is EEaa.
• For position 4: The row is eA and the column is eA. The genotype is eeAA.
• For position 5: The row is ea and the column is ea. The genotype is eea a.

Answer:

1. EeAA
2. EEAa
3. EEaa
4. eeAA
5. eea a