In the zebrafish model, what is the value of gynogenetic haploid screening?

Question

BlackTom AI · Accepted Answer

The question asks about the value of gynogenetic haploid screening in the zebrafish model, so we need to evaluate each statement in that context.
Option A: 'A. It is fast way of obtaining homozygous recessive mutants' This is describing the main practical benefit: gynogenetic haploid screening can reveal recessive phenotypes quickly because the offspring are haploid and express maternal alleles, allowing researchers to observe loss-of-function phenotypes without waiting for multiple generations. In many zebrafish screening protocols, this approach accelerates the identification of recessive mutations because the haploid embryos display the maternal genotype directly, effectively bypassing the need for inbreeding to homozygosity. This makes the statement plausible as a true value of the technique.
Option B: 'B. It allows identification of the mutant gene in the F0 generation' This is misleading. In haploid screens, you are observing phenotypes in haploid offspring derived from eggs activated by irradiated sperm, and you typically do not identify the causal gene directly in the F0 generation; positional cloning or sequencing is usually required across generations or with additional mapping steps. So this claim overstates the immediacy of gene identification in F0 and is not accurate as a general description of the method’s value.
Option C: 'C. It produces 100% homozygous offspring' This is incorrect because haploid embryos contain a single set of chromosomes (n), not a diploid pair, so they are not homozygous for alleles in the sense used for diploid organisms. The concept of 100% homozygosity applies to diploid homozygous lines, not to haploids, making this statement factually wrong in the zebrafish context.
Option D: 'D. It generates all haploid offspring that are then mated to yield F2' This misstates the workflow. Gynogenetic haploid screening yields haploid individuals for phenotypic assessment, but the method is not about mating all haploids to produce an F2 in this screening paradigm. Fertile haploids are rarely mated to produce a meaningful F2 in standard gynogenetic haploid screens, so this option describes a process that does not align with the typical purpose of the approach.
In summary, the strongest claim that aligns with the established use of gynogenetic haploid screening in zebrafish is that it provides a fast route to observe recessive phenotypes (Option A), while the other statements contain conceptual or procedural inaccuracies regarding generation, fertility, or the immediacy of gene identification.

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