In a typical Punnett square for a monohybrid cross between heterozygous yellow peas (Yy) and yellow peas (YY or Yy), the ratio of yellow to green peas can be determined.
If we assume the cross is between two heterozygous yellow peas (Yy x Yy), the possible genotypes from the Punnett square would be:
- YY (yellow)
- Yy (yellow)
- Yy (yellow)
- yy (green)
This results in a ratio of:
- 3 yellow (YY and Yy) to 1 green (yy).
Therefore, the correct answer would be:
3 yellow peas: 1 green pea.