Question

Normal Multiple Select Question A student learns that the traits offspring express depend on the genes they receive from their parents during meiosis. She knows that brown eyes (B) are dominant to blue eyes (b). She views a Punnett square of a cross between a homozygous parent and a heterozygous parent. Which TWO questions can the student answer using the Punnett square? A. What is the genotype of the female parent? B. What are the genotypes of the grandparents? C. What is the probability of an offspring being male? D. What is the probability of an offspring carrying a recessive allele? E. What is the percent likelihood of an offspring having brown eyes?

Answer 1

Using a Punnett square of a cross between a homozygous parent (BB) and a heterozygous parent (Bb) for eye color traits, the student can answer the following two questions:

D. What is the probability of an offspring carrying a recessive allele?
The Punnett square will reveal that the offspring's possible genotypes will be either BB or Bb. From this, the student can determine the probability of an offspring carrying the recessive allele (b).

E. What is the percent likelihood of an offspring having brown eyes?
By using the Punnett square, the student can also determine the likelihood of offspring having brown eyes (either genotype BB or Bb), which will provide the percentage of offspring that can express the dominant trait.

The other options do not pertain to what can be determined from the Punnett square in this scenario.