A temperature-sensitive mutant of the zyg gene. zyg-1(oj7), zyg-1(b1), zyg-1(it4), zyg-1(it37) are alleles of zyg-1 gene, each one resulting in temperature sensitive mutations. C. elegans II, p.1046
One of two haploid nuclei in a newly fertilized embryo (one maternal and one paternal) (adapted from The Cell A Molecular Approach. Geoffrey M. Cooper 1997)