In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will reproduce only offspring with smooth leaves?

Rationale

ff by ff will reproduce only offspring with smooth leaves.

In this scenario, all offspring produced from a cross between two plants with the genotype ff will inherit the recessive trait for smooth leaves, as there are no dominant alleles present to express the fuzzy leaf trait.

A (FF by ff) YOUR ANSWER

This cross will produce offspring with the genotypes Ff and FF. Since F is dominant, all offspring will exhibit the fuzzy leaf phenotype, resulting in no smooth leaf plants.

B (ff by ff) CORRECT

This cross will exclusively yield offspring with the genotype ff. Since both parents are homozygous recessive, all offspring will express the recessive smooth leaf trait, confirming that this is the only cross that will produce only smooth leaves.

C (Ff by Ff) YOUR ANSWER

This cross will produce offspring with the genotypes FF, Ff, and ff in a ratio of 1:2:1. The presence of the dominant F allele means that some offspring will display the fuzzy leaf phenotype, thus not producing only smooth leaves.

D (FF by FF) YOUR ANSWER

This cross will produce offspring that are all FF, meaning every offspring will exhibit the fuzzy leaf phenotype. There will be no smooth leaf plants, as there are no recessive alleles present.

Conclusion

In genetic crosses, the expression of dominant and recessive traits is critical in determining the phenotypes of the offspring. The cross of ff by ff ensures that all offspring display the smooth leaf phenotype, as both parents contribute only recessive alleles. This emphasizes the importance of understanding genotype combinations in predicting offspring traits in plant breeding.

In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will reproduce only offspring with smooth leaves?

ff by ff will reproduce only offspring with smooth leaves.

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