What is the expected phenotypic ratio in the offspring of a monohybrid cross?
Practice Questions
Q1
What is the expected phenotypic ratio in the offspring of a monohybrid cross?
1:1
3:1
9:3:3:1
1:2:1
Questions & Step-by-Step Solutions
What is the expected phenotypic ratio in the offspring of a monohybrid cross?
Correct Answer: 3:1
Step 1: Understand what a monohybrid cross is. It involves crossing two organisms that differ in one trait.
Step 2: Identify the dominant and recessive traits. The dominant trait is the one that appears in the offspring, while the recessive trait does not.
Step 3: Use a Punnett square to visualize the possible combinations of alleles from the parents.
Step 4: Count the number of offspring that show the dominant trait and the number that show the recessive trait.
Step 5: Calculate the ratio of dominant to recessive traits. In a typical monohybrid cross, you will find 3 showing the dominant trait for every 1 showing the recessive trait.
Step 6: Conclude that the expected phenotypic ratio in the offspring of a monohybrid cross is 3:1.
