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Theriogenology > Reptile Reproduction > Flashcards

Reptile Reproduction Flashcards

1
Q

How do most reptile reproduce?

A

Sexually

By layiing eggs or giving birth to live young

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2
Q

True or false: reptiles have external genitalia

A

False

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3
Q

True or false: all reptiles have internal fertilization

A

True

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4
Q

What are the reproductive organs of males?

A

2 testicles and a penis or a hemipenes

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5
Q

What is a hemepene?

A

A paired invagination of the cloaca that are everted for reproduction

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6
Q

What reptiles is a typical penis found in?

A

Turtles and crocs

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7
Q

What part of the egg allows for oxygen exchange?

A

Hard or leathery shell

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8
Q

Where are eggs deposited?

A

In a nest in left unattended

Crocs and some snakes guard eggs

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9
Q

True or False: reptiles are not yet fully developed upon hatching

A

False

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10
Q

When is the period of mortality the greatest?

A

Following hatching

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11
Q

What are the 2 modes of reproduction?

A

Viviparity (live bearing)

Oviparity (egg laying)

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12
Q

What species of reptiles are viviparous?

A

Snakes
Lizards
Amphisbaenids (legged worms)

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13
Q

What species of reptiles are oviparous?

A

All turtles and crocs

Some snakes

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14
Q

What is sex determination dependent on in most turtles, all crocs, tuatara, and some squamates?

A

Temperature

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15
Q

What is the mechanism of TSd?

A

Thought there is a link between temperature control and production of sex steroids in the developing embryo
May be preferential surviving of a certain sex at varying temperatures

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16
Q

What species show parental care?

A 
Crocodilians
Some squamates (snakes and lizards)
Turtles rarely do
17
Q

How many reptiles show asexual reproduction?

A

About 30 species of lizards and 1 species of snake

18
Q

What is unique about the species that use asexual reproduction?

A

Result of hybridization of 2 species
Only sex is female, entire population is unisexual
Essentially clone themselves
No sperm is required in reproduction

Theriogenology (10 decks)

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