A) secrete fluid into the lumen of seminiferous tubules to support sperm development
B) secrete paracrines that stimulate spermatogenesis
C) provide nutrients for developing sperm
D) secrete androgens
E) form the blood -testis barrier

A) the release of incompetent ova.
B) altered length of the menstrual cycle.
C) the complete cessation of sex hormone release.
D) changes in hormone secretory patterns.
E) inability to release an ovum in the presence of luteinizing hormone (LH) surge.

A) either two maternal or two paternal sister chromatids.
B) a random mixture of maternal and paternal alleles on each of two sister chromatids.
C) a maternal and a paternal sister chromatid.
D) either a maternal or a paternal sister chromatid.
E) a random mixture of maternal and paternal alleles on one sister chromatid.