Comparative Test 4 (R1)
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What is parthenogenesis?
A special case of reproduction in which two sexes are not required.
Sex may be determined by _____ or _____.
- Chromosomal (sex chromosomes)
- Environment (teperature of incubation determines sex of some reptiles)
Sex of Turtles and lizards are determined by what?
Teperature of incubation determines sex
What are the basic components of the reproductive system?
- Gonads (Testes and ovaries)
- Gametes (sperm and eggs)
- Associated ducts, glands, chambers, and intromittent organs.
The cortex of the gonad is of _____ origin, the _____ is of mesodermal orgin.
The indifferent gond is invaded by _____ that grows into the medulla.
cords of germinal epithelium
Describe primary sex chords (cords of germinal epithelium) in males and females.
- In males develop into seminiferous tubules of testis.
- In females, regardless and are replaced by secondary sex chords.
Testies are connected to the body wall by what?
Ovaries are connected to the body wall by what?
The bulk of testies is _____.
The bulk of the ovary is _____.
Describe the development of Rete chords and describe them in males and females.
- Develop between developing primary sex chords and more anterior mesonephric tubules.
- In males, these canalize connecting gonad to the mesonephric tubules and archinephric duct, taking them over for the route of sperm passage.
- In females, rete chords regress and become vestigial.
Describe the mullerian duct (oviduct).
- Forms from a groove-like invagination along mesonephros.
- Begins development in both sexes but degenerates in males and becomes oviduct in females.
- Connected to body wall by mesotubarium.
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