Practice question

Tetrad analysis depends crucially on physical containment four meiotic products together within common ascus sac, allowing all chromosomes single meiosis scored simultaneously. In haploid fungi like Neurospora and Saccharomyces ascus wall retains spores after meiosis, facilitating orderly recovery and accurate genotyping via micromanipulation dissection. Diploid plants and mammals disperse meiotic products immediately after formation, so tetrads uncollectible and genetically lost. Haploidy simplifies phenotype as genotype directly observable without dominance masking heterozygous effects. Small genome, rapid growth, large progeny numbers make fungi ideal for recombination mapping studies.