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Reproduction Lab Final > Gestation > Flashcards

Gestation Flashcards

1
Q

What is a zygote?

A

A diploid cell that results from the fusion of male and female pronuclei via syngamy

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2
Q

(T/F) Embryos are not recognizable as a member of a specific species

A

True!

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3
Q

(T/F) The zygote undergoes several mitotic divisions inside the ZP that results in an overall size change

A

False!

Size does not change

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4
Q

At what stage of development can we not distinguish the number of cells?

A

Morula

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5
Q

(T/F) Maternal recognition of pregnancy is necessary subsequent to embryo attachment to the uterine wall

A

True!

or else luteolysis will occur

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6
Q

Describe the pregnancy recognition signals in cows

A

Bovine interferon tau
Produced by the conceptus
15-16 days of gestation

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7
Q

Describe the pregnancy recognition signals in sheep

A

Ovine interferon tau
Produced by the conceptus
13-14 days of gestation

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8
Q

Describe the pregnancy recognition signals in sows

A

Estradiol
Produced by conceptus
Reroutes PGF2alpha
11-12 days of gestation

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9
Q

Describe the pregnancy recognition signals in mare

A

Protein/estrogen complex

Beginning day 12 the embryo must migrate 12-15x per day

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10
Q

The inner cell mass contains ___ germ layers, which will differentiate into…

A

Mesoderm

Muscle, skeleton, cardiovascular system, reproductive system

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11
Q

The ectoderm will differentiate into…

A

Nervous system, skin, hair

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12
Q

The endoderm will differentiate into…

A

Digestive system, lungs, endocrine system

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13
Q

Where does the yolk sac originate from?

What is its function?

A

Fetal midgut

Nutrient supply for early embryo

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14
Q

(T/F) The amnion absorbs uterine secretions from the endometrium to stimulate early embryonic development

A

False!

Yolk sac does that

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15
Q

___ is the innermost membrane directly surrounding the fetus
What is its function?

A

Amnion

Protection from injury and provides lubrication for parturition

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16
Q

(T/F) The amnion prevents lung collapse and opens the digestive tract

A

True!

17
Q

The allantois originates from the ___ and forms the ___

A

Gut

Umbilicus

18
Q

The (Allantois/Amnion) supports blood vessels and functions as a reservoir for nutrients and wastes

A

Allantois

19
Q

___ is the outermost membrane in direct contact with uterine tissue

A

Chorion

20
Q

(T/F) The amnion is the site of hormone production, nutrient and gas exchange

A

False!

Chorion does that

Reproduction Lab Final (8 decks)

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