BIOL10210 Lecture Notes - Lecture 12: Platypus, Y Chromosome, Sexual Differentiation
Document Summary
Behavioral: social circumstance: limpet- all come out male, when little male, when they are in group they stay male or stuck in intersex. When they get big and isolated become female. Animals have to be touching each other, biochemical signal: another worm two females run into each other, smaller one turns into a male, yet females grow slower. So eventually everyone turns into a hermaphrodite: blue wrasse fish- smaller male bigger female, transition in gender, impact on each other dependent on size. Sequential hermaphrodites: diffe(cid:396)e(cid:374)(cid:272)es p(cid:396)o(cid:271)a(cid:271)ly due to the e(cid:374)(cid:448)i(cid:396)o(cid:374)(cid:373)e(cid:374)t, ho(cid:449) f(cid:396)e(cid:395)ue(cid:374)tly you"ll (cid:396)u(cid:374) i(cid:374)to you(cid:396) environment, use what you have learned so far to explain why flexible gender would evolve. Evolution has come up with clever ways to deal with the craziness of the environment. Females are sedentary, move very slowly or scattered: now explain why a male would be reduced to 1/200000 the size of the female.
