- vulva location variant
Any variation in the male's ability to locate his partner's vulva when backing along the ventral side of the partner during mating compared to control. In C. elegans the male stops at the vulva, coordinates his movements to the hermaphrodite's, and positions his tail precisely over the vulva so that he may insert his spicules and ejaculate.
- male response to hermaphrodite variant
Any variation in the response by the male to a hermaphrodite after initial contact following mate finding compared to control. In C. elegans the male stops forward locomotion, presses the ventral side of his tail against his partner's body, and begins moving backward along the hermaphrodite. Male response behavior is initiated when sensory neurons located in the rays of his tail contact a potential mate.
- sperm transfer defective
Any defect in the process whereby a male inseminates his partner by introducing sperm into the genital tract.
- precise vulval location variant
Any variation in the mating process that includes the male positioning his tail precisely over the vulva so that he may insert his spicules and ejaculate compared to control. In C. elegans precise vulva location (coordinating movement and tail positioning) requires the post cloacal sensillium and the spicules.
- male response to contact defective
The inability of a male to respond properly to a potential mate after contact. In C.elegans, proper response includes apposing the ventral side of his tail to the hermaphrodite's body and swimming backward.
- octanol chemotaxis defective
Failure to execute the characteristic response to 1-octanol as defined by control animals. In C.elegans 1-octanol is typically a repellant.
- excretory secretory system morphology variant
Variations in the form, structure or composition of related tissues that allow the animal to secrete saline fluid and maintain a proper salt balance compared to control. In C. elegans, four cell types (1 pore cell, 1 duct cell, 1 canal cell and a fused pair of gland cells) make up the excretory system (Wormatlas).
- octopamine metabolism variant
Animals exhibit variations in any chemical reaction or pathway involving octopamine, 1-(p-hydroxyphenyl)-2-aminoethanol, compared to control.
- X chromosome nondisjunction
The frequency of sex chromosome segregation is perturbed, resulting in the production of exceptional gametes (e.g. ova or sperm) and populations with a sex ratio altered from the rate of 1:500 as observed for control populations.