Insert capacity question: λ gt10 and λ gt11 lambda vectors typically accommodate cloned DNA fragments up to about what size range?

Introduction / Context:
Different λ vectors have different insert capacities depending on whether they are insertion or replacement types. λ gt10 and λ gt11 are classic insertion/expression vectors with modest capacities, appropriate for cDNA clones and short genomic fragments rather than very large inserts.

Given Data / Assumptions:

• λ insertion vectors carry additional sequences, limiting insert size.
• Replacement vectors (other λ types) can accept larger inserts by replacing dispensable regions.
• Physical packaging constraints of lambda heads set upper and lower genome size limits for viable phage production.

Concept / Approach:
Viable lambda particles require a genome within a defined size window. Insertion vectors like λ gt10/11 allow only several kilobases of foreign DNA (commonly about 6–7 kb, sometimes up to ~8–10 kb depending on the build), whereas replacement vectors can accept larger fragments up to roughly 20 kb or more.

Step-by-Step Solution:

Verification / Alternative check:
Historic manuals and vector maps list capacities for λ gt10/11 in the mid–single-digit kilobase range for reliable cloning and packaging.

Why Other Options Are Wrong:

• B: Too small; standard plasmids handle >1–2 kb easily.
• C/D: Reflect cosmid or λ replacement capacities, not λ gt10/11 insertion vectors.
• E: ≥100 kb indicates BAC/YAC scales, not lambda.

Common Pitfalls:
Assuming all λ vectors accept very large inserts; capacity depends on vector architecture.

Final Answer:
6–7 kb