In a monohybrid cross, if all the F1 generation offspring display the dominant phenotype, what cannot be concluded about the parental genotypes?
Understand the Problem
The question is asking what parental genotypes are impossible if the F1 generation all display the dominant phenotype in a monohybrid cross. A monohybrid cross involves the inheritance of a single trait. The dominant phenotype appearing in all offspring implies certain constraints on the parental genotypes.
Answer
We cannot determine if the dominant parent was homozygous or heterozygous.
If all F1 generation offspring display the dominant phenotype in a monohybrid cross, we cannot definitively conclude whether the parent with the dominant trait was homozygous dominant or heterozygous. Both scenarios would result in all offspring displaying the dominant phenotype.
Answer for screen readers
If all F1 generation offspring display the dominant phenotype in a monohybrid cross, we cannot definitively conclude whether the parent with the dominant trait was homozygous dominant or heterozygous. Both scenarios would result in all offspring displaying the dominant phenotype.
More Information
In a monohybrid cross, we examine the inheritance of only one trait. The appearance of the dominant phenotype in the F1 generation can arise from different parental genotypes, making it impossible to know the exact genotype of the dominant parent without further breeding experiments (like a test cross).
Tips
A common mistake is assuming the dominant parent must be homozygous. Remember that a heterozygous genotype can also produce the dominant phenotype.
Sources
- Monohybrid Cross - an overview | ScienceDirect Topics - sciencedirect.com
- Mendel's law of segregation | Genetics (article) - Khan Academy - khanacademy.org
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