Eggs are laid but some collapse due to fragile chorion.
Homozygous females lay eggs that fail to hatch.
fs(1)M134, fs(1)M46[+]/fs(1)M461 has female semi-sterile | dominant phenotype
fs(1)M13[+]/fs(1)M134, fs(1)M461 has female semi-sterile | dominant phenotype
Leaky allele.