Question

approximately what fraction of offspring from this cross will have a brown body? choose 1 answer: a (\frac{1}{4}) b (\frac{1}{2}) c (\frac{3}{4}) d (\frac{4}{4})

Explanation:

Step1: Count total offspring

The Punnett square has 4 cells, so total offspring combinations: \( 4 \).

Step2: Identify brown - body genotypes

Assume \( B \) is dominant for brown body. Genotypes \( BB \) and \( Bb \) show brown body. From the square, \( BB \) (2 cells) and \( Bb \) (2 cells) are brown - body. Total brown - body cells: \( 2 + 2=4 \).

Step3: Calculate the fraction

Fraction of brown - body offspring \(=\frac{\text{Number of brown - body cells}}{\text{Total cells}}=\frac{4}{4} \).

Answer:

D. \(\frac{4}{4}\)