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

The cross of two homozygous recessive plants (ff by ff) will reproduce only offspring with smooth leaves.

In this case, both parent plants possess two copies of the recessive allele (f) for smooth leaves. As a result, all their offspring will inherit the smooth leaf trait, since no dominant allele (F) for fuzzy leaves is present to override the recessive trait.

A (FF by ff) YOUR ANSWER

This cross involves a homozygous dominant plant (FF) with a homozygous recessive plant (ff). All offspring in this scenario will inherit one dominant allele from the FF parent and one recessive allele from the ff parent, resulting in a genotype of Ff. The presence of the dominant allele will lead to the expression of the fuzzy leaf trait in the offspring, not the smooth leaf trait.

B (ff by ff) CORRECT

This cross involves two homozygous recessive plants (ff by ff). Since both parents only carry recessive alleles for the leaf texture, all offspring will also be homozygous recessive (ff) and will express the smooth leaf trait.

C (Ff by Ff) YOUR ANSWER

This cross involves two heterozygous plants (Ff by Ff). In this case, the offspring can inherit any combination of the parents' alleles—FF, Ff, or ff. While some offspring may express the smooth leaf trait (ff), others will express the dominant fuzzy leaf trait (FF or Ff).

D (FF by FF) YOUR ANSWER

This cross involves two homozygous dominant plants (FF by FF). As both parents carry only the dominant allele, all offspring will inherit the genotype FF and will express the dominant fuzzy leaf trait, not the smooth leaf trait.

Conclusion

In the context of dominant and recessive traits, only a cross between two homozygous recessive plants (ff by ff) can produce offspring with the recessive smooth leaf trait. This is due to the absence of a dominant allele in the parents, which would otherwise override the expression of the recessive trait. The other crosses either have the potential to produce offspring with the dominant fuzzy leaf trait or will definitely produce offspring with the fuzzy leaf trait.

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?

The cross of two homozygous recessive plants (ff by ff) will reproduce only offspring with smooth leaves.

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