In zebrafish, what is the advantage of gynogenetic haploid screening?

Question

BlackTom AI · Accepted Answer

Exploring the concept, let's evaluate what gynogenetic haploid screening in zebrafish is and what each option implies.
Option a: 'It can be used to produce transgenic report fish.' While zebrafish researchers do create transgenic lines, gynogenetic haploid screening specifically leverages haploid embryos produced after sperm-activation without paternal genome contribution. This process is not primarily about producing transgenic reporter fish, so this statement overstates the method's purpose and is inaccurate as a description of the technique's main advantage.
Option b: 'It is a quick way to screen for homozygous recessive mutant fish.' This aligns with the underlying logic: gynogenetic haploids reveal recessive phenotypes directly because there is no paternal genome to mask maternal recessive alleles, allowing rapid identification of homozygous recessive mutants among haploid progeny. In practice, haploid screening can expedite genotype-phenotype characterization for recessive mutations, making this a true and useful advantage.
Option c: 'It allows the mis-expression of several genes at once.' The method does not inherently cause mis-expression of multiple genes; it focuses on using the egg's genome with paternal genome excluded or inactivated. Mis-expression phenomena are not a designed feature of gynogenetic haploid screening, so this claim is not correct.
Option d: 'Only the male genome contributes to the offspring DNA, not the female genome.' This is the opposite of what gynogenetic haploid screening does. Typically, paternal DNA is excluded or not transmitted in gynogenesis, so the offspring DNA, when present, largely reflects the maternal genome, not exclusively the paternal one. Therefore this statement is incorrect about the genetic contribution in this screening method.

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