Texas FFA Nursery Landscape Practice Exam

Which of the following is the best definition of an F1 hybrid?

1. A. The first cross between the offspring of A, B, C, D, and E generations

2. B. The first generation of seedlings from genetically different parents

3. C. A plant that is genetically inferior to all other cultivars

4. D. A plant that is genetically superior to all other cultivars

The correct answer is: B. The first generation of seedlings from genetically different parents

The best definition of an F1 hybrid is that it refers to the first generation of seedlings produced from genetically different parents. F1 hybrids arise when two distinct parental lines are crossed, typically chosen for their desirable traits. This first generation often exhibits a phenomenon known as hybrid vigor or heterosis, where the offspring demonstrate improved traits such as growth rate, yield, disease resistance, or overall health compared to their parents. This definition is essential in plant breeding as it helps breeders and growers understand the potential advantages of F1 hybrids in crop production and landscaping. In contrast, other options do not accurately capture the essence of an F1 hybrid; for instance, describing it as genetically inferior or superior to other cultivars does not reflect the hybrid's direct relationship to its parental lines or its specific classification as the first generation from a cross.