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Reproduction and Breeding > Gametogenesis > Flashcards

Gametogenesis Flashcards

1
Q

What is a gamete?

A

Mature haploid germ cell

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2
Q

What is genesis?

A

Formation

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3
Q

When does gametogenesis occur?

A

At puberty, from birth, in utero

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4
Q

What chromosomes do the male have?

A

X and Y

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5
Q

What gene is found on the Y chromosome?

A

SRY gene

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6
Q

Where is the SRY gene found?

A

Pre sertoli cells

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7
Q

What does the SRY gene do?

A

Gives instruction to make sertoli cells

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8
Q

What other gene does SRY switch on?

A

Sox9

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9
Q

What does the Sox9 do?

A

Turns on testicular genes

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10
Q

When would it turn into ovaries?

A

After 11.3 dpc as Sox9 expression is not maintained

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11
Q

What genes are found in the female?

A

Wnt4 & Foxl2

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12
Q

Where are Wnt4 & Foxl2 found?

A

Expressed by granulosa cells

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13
Q

How are the female genes suppressed?

A

By the SRY

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14
Q

What endocrine features control testis development?

A

Leydig cells: androgens - Sertoli cells: AMH hormone

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15
Q

What does the AMH do?

A

Develops the seminiferous cords

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16
Q

If theres a lack of AMH what does it mean?

A

A uterovaginal canal forms from mullerian duct

17
Q

What do primordial germ cells do?

A

Go through mitotic proliferation

18
Q

What are the main 3 stages of it?

A

Mitotic proliferation, meiotic division, cytodifferentation

19
Q

What are the first two stage called together?

A

Spermatocytogenesis

20
Q

What is the last stage called?

A

Spermiogenesis

21
Q

Describe the mitosis stage?

A

Spermatogonium splits into a type A and type B spermatogonium

22
Q

Describe the Meiosis 1 stage?

A

The type B spermatogonium becomes a primary spermatocyte

23
Q

What is the ending of Meiosis 1 stage?

A

The primary spermatocyte splits into 2 secondary spermatocytes

24
Q

What is the meiosis 2 stage?

A

The 2 secondary spermatocytes break into 4 spermatids

25
Q

What is the last meiosis 2 stage?

A

Spermiogenesis

26
Q

What happens in spermiogenesis?

A

Nuclear condensation, Acrosome formation, Flagellum formation, Cytoplasm reduction & Maturation

27
Q

Is the initiation cyclical?

A

Yes

28
Q

The duration is what…

A

species specific

29
Q

What does maturation do?

A

Absorbs excess fluid, cleans cell,

30
Q

What is ejaculation?

A

Seminal fluid - transport, lubrication

31
Q

What is semen made of?

A

Seminal fluid & spermatozoa

32
Q

Which animals is sperm deposited at the vagina?

A

Human, cattle, rabbits

33
Q

Which animals is sperm deposited at the uterus?

A

Horse, Pigs, rodents

Reproduction and Breeding (6 decks)

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