Question

If one parent has two dominant alleles and another parent has two recessive alleles, the offspring will have____. (Hint: Draw a Punnett square for parents TT and tt.)

A. The recessive phenotype.
B. The dominant phenotype.
C. Two dominant alleles.
D. Two recessive alleles.

Answer 1

When one parent has two dominant alleles (TT) and the other has two recessive alleles (tt), the offspring's genotype will be Tt and display the dominant phenotype.

Step-by-step explanation:

If one parent has two dominant alleles (TT) and another parent has two recessive alleles (tt), the offspring will obtain one allele from each parent. Each of the offspring's genotype would thus be Tt, carrying one dominant and one recessive allele. According to Mendelian genetics, the presence of a dominant allele (T) will determine the phenotype, meaning the offspring will display the dominant phenotype.

Using a Punnett square to represent this cross, all boxes would result in the genotype Tt, indicating 100 percent probability of the offspring showing the dominant phenotype. So, the correct answer is B. The dominant phenotype.