Week 1 Objective 1 and 2: list and describe the four phases of gametogenesis Flashcards

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1
Q

Phases of Gametogenesis (4)

A
  1. Extraembryonic origin of germ cells and their migration to the gonads
  2. Proliferation of germ cells via mitosis
  3. Reduction of chromosomal number 2n –> n
  4. Structural and functional maturation of the eggs and spermatozoa
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2
Q

1st phase of gametogenesis

A

Extraembryonic Origin of Germ Cells

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3
Q

First appearance of germ cells in human embryogenesis

A
  1. 24 days after fertilization

2. founded in endodermal layer of yolk sac

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4
Q

Migration route of germ cells

A

yolk sac –> hindgut epithelium –> dorsal mesentery —> developing gonads

through dorsal mesentery into developing gonads

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5
Q

Male gametes =

A

spermatozoa

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6
Q

Female gametes =

A

Eggs

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7
Q

Teratomas

A

Growths from misdirected and migrating primordial germ cells

Contain mixtures of highly differentiated tissues

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