Oogenesis and Spermatogenesis Flashcards

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1
Q

Order of Oogenesis (occurs in female fetus before birth)

A
  1. Oogonium (2n)
  2. Primary Oocyte (undergoes Meiosis I)
  3. Secondary Oocyte (and first polar body)
    * Secondary Oocyte undergoes Meiosis II)
  4. Ovum (n) (and second polar body)
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2
Q

what undergoes meiosis is oogenesis?

A

Primary oocyte

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3
Q

what undergoes meiosis II in oogenesis?

A

secondary oocyte

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4
Q

at what point is oogenesis arrested until the female reaches puberty?

A

primary oocyte

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5
Q

Order of Spermatogenesis

A
  1. Spermatogonium (2n)
  2. Primary Spermatocyte
    * Undergoes Meiosis I
  3. Secondary spermatocytes
    * Undergo Meiosis II
  4. Sperm cells (n)
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6
Q

what undergoes Meiosis I in spermatogenesis?

A

primary spermatocyte

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7
Q

what undergoes meiosis II in spermatogenesis?

A

secondary spermatocyte

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8
Q

Conditions that occur due to nondisjunction:

A

Down’s Syndrome (trisomy 21)
Turner’s syndrome (45X)
Kleinfelter’s syndrome (XXY)
trisomy 18

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9
Q

four stages of early development

A
  1. cleavage
  2. implantation
  3. gastrulation
  4. neurulation
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10
Q

stage of early dev

mitotic divisions of blastula?

A

cleavage

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11
Q

stage of early dev

embryo implants during blastulation

A

implantation

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12
Q

stage of early dev

forms 3 germ layers: ectoderm, endoderm, medoderm

A

gastrulation

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13
Q

stage of early dev
germ layers develop a nervous system
forms from ectoderm of gastrula

A

neurulation

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