ZOO 3050 Lecture Notes - Lecture 11: Zona Pellucida, Oviparity, Cell Cycle
Document Summary
Implications: hybridization, species-specific signals are critical for fertilization, self-fertilization, advantages from selection perspective, can also lead to expression of deleterious mutations, in-vitro fertilization. In some cases there are intermediate stages (can feed but they don"t have to: gradient of developmental or feeding modes, viable hybrids between these two species, larvae of these hybrids show an intermediate mode of development. Depends whether sperm or egg comes from one or the other species. Really important which species the egg comes from. Sperm comes from tuberculata (feeding species) and egg comes from non-feeding species. Wouldn"t work the opposite way because the maternal reserves are in the egg. Two species, one is feeding and the other species on the bottom is not feeding. If you cross these two species you get the formation of a gut. If the sperm is from the feeding species then you don"t get a gut. The feeding species is contributing the material to form a gut.