Reptile Reproduction Flashcards
Most reptiles reprod. ______ and most lay eggs or give birth to live young.
sexually
Reptiles do not have ___ ____ and all have ____ _____
External genitalia; internal fertilization
Reprod. organs or male reptiles–>
Have two testicles, and either a penis or a hemipenes (hemipenes is not connected to the urinary tract and its function is ONLY for mating)
Hemepene involves invagination of the _____ that are everted for reprod. it often has spines or hooks and is forked in appearance
Cloaca
Typical penis is found in what two types of reptiles that we discussed?
Crocs and turtles
Reptile reproduction eggs are self sufficient, number and size varies greatly between species. What two types of reptiles guard their eggs?
crocs and some types of snakes guard their eggs
What are the two modes of reproduction of the reptiles?
Viviparity and oviparity
What does “Viviparity” mean?
Live bearing
Snakes, lizards, and amphibaenids- legged worms
Oviparity:
Egg-laying, all turtles and crocs and some types of snakes do this
Sex determination in reptiles is based off of genetics, temp. High temp means more of the eggs will be ____ in some species
females
Mechanism of TSD (temperature sex determination):
poorly understood, though there is a link between temp control and production of sex steroids in the developing embryo. Thought there may be preferential survival of certain sex at varying temps. Allows the female to choose the sex by location of nesting
All ___ care for their young by guarding
Crocs
Asexual reprod. (Pathogenesisis)
A result of hybridization of two species, only sex is female and entire population is unisexual. Essentially clone themselves, no sperm req. Occurs most often in lizards (and 1 species of snake)
