BIOL10210 Lecture Notes - Lecture 17: Amplexus, Heterozygote Advantage, Spermatophore
Document Summary
Dominance behavior: so(cid:373)eti(cid:373)es it"s a physi(cid:272)al, appeara(cid:374)(cid:272)e display or a (cid:271)eha(cid:448)ioral display, males larger than females in many species. Lamprologus callipterus dimorphism caused by ecological factors: red deer-dimorphism caused by intrasexual competition (within the sex), fighting, showing dominance without fighting, calling, roar, strutting, pawing, appearing large. Cuckold behavior: the dominant, the sneaker, and the satellite bluegill sunfish. In a lek, a group of male display together for females to evaluate the talent. Female reproductive tract actively tries to kill sperm, seen as foreign entity: gradually releasing sperm as the plug disintegrates, scent-mark the female, provide nourishment for the female. Are their advantages in females mating with more than one male: rise in probability of fertilization. Increase in genetic diversity of offspring: nutritional benefit, if males provide nutritional gifts at copulation, e(cid:374)sure her so(cid:374)"s (cid:272)o(cid:373)pete (cid:449)ell agai(cid:374)st other (cid:373)ales, if the trait is herita(cid:271)le.
