Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability that offspring will be red-eyed males is 25 percent?
Answer
A
Image with description 2 by 2 Punnett square. Columns labeled X superscript lowercase r and Y. Rows labeled X superscript uppercase R and X superscript uppercase R. Top row: X superscript uppercase R X superscript lowercase r, X superscript uppercase R Y. Bottom row: X superscript uppercase R X superscript lowercase r, X superscript uppercase R Y.
B
Image with description 2 by 2 Punnett square. Columns labeled X superscript lowercase r and Y. Rows labeled X superscript uppercase R and X superscript lowercase r. Top row: X superscript uppercase R X superscript lowercase r, X superscript uppercase R Y. Bottom row: X superscript lowercase r X superscript lowercase r, X superscript lowercase r Y.
C
Image with description 2 by 2 Punnett square. Columns labeled X superscript lowercase r and Y. Rows labeled X superscript lowercase r and X superscript lowercase r. Top row: X superscript lowercase r X superscript lowercase r, X superscript lowercase r Y. Bottom row: X superscript lowercase r X superscript lowercase r, X superscript lowercase r Y.
D
Image with description 2 by 2 Punnett square. Columns labeled X superscript uppercase R and Y. Rows labeled X superscript lowercase r and X superscript lowercase r. Top row: X superscript lowercase r X superscript uppercase R, X superscript lowercase r Y. Bottom row: X superscript lowercase r X superscript uppercase R, X superscript lowercase r Y.