QQuestionBiology
QuestionBiology
"Which of the following statements correctly describes a dihybrid cross?
A dihybrid cross results in a 3:1 phenotype ratio in the F^2 offspring.
A dihybrid cross involves two parents.
A dihybrid cross involves organisms that are heterozygous for two characters.
A dihybrid cross produces two offspring."
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Answer
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Step 1:I'll solve this problem step by step, focusing on the key concepts of dihybrid crosses in genetics.
Step 2:: Understanding Dihybrid Crosses
A dihybrid cross is a genetic cross that involves two different genes (or two different characteristics) simultaneously. This means the parents are heterozygous for both genes being studied.
Step 3:: Analyzing the Genetic Terminology
- In a dihybrid cross, the parents are typically $$Aa Bb$$ (heterozygous for two different genes)
- "Dihybrid" means two hybrid traits - "Hybrid" refers to organisms with different alleles for a particular gene
Step 4:: Examining the Possible Statements
Let's evaluate each statement: A. "A dihybrid cross results in a 3:1 phenotype ratio in the F^2 offspring." - This is INCORRECT. A dihybrid cross actually results in a 9:3:3:1 phenotype ratio in the F^2 generation. B. "A dihybrid cross involves two parents." - This is technically TRUE, but not the most precise description of a dihybrid cross. C. "A dihybrid cross involves organisms that are heterozygous for two characters." - This is the CORRECT statement. A dihybrid cross specifically involves organisms with heterozygous genes for two different traits. D. "A dihybrid cross produces two offspring." - This is INCORRECT. A dihybrid cross can produce multiple offspring with various genetic combinations.
Step 5:: Detailed Explanation of the Correct Answer
- $$B$$ and $$b$$ represent alleles of another gene
A dihybrid cross involves parents that are heterozygous for two different genes.
Final Answer
The correct statement is that a dihybrid cross involves organisms that are heterozygous for two characters.
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