Meiosis Flashcards

1
Q

What is the first meiosis division referred to as?

A

Reductional

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2
Q

What is the second meiosis division referred to as?

A

Equational

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3
Q

What is crossing over?

A

Process by which the shuffling of genetic material occurs

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4
Q

When does crossing over occur?

A

Prophase 1

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5
Q

How does crossing over occur?

A

Homologous chromosome attach at the to chiasmata to form a tetrad

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6
Q

What splits in anaphase 1?

A

Homologous chromosomes

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7
Q

What splits at anaphase 2?

A

Sister chromatids

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8
Q

What are the differences between mitosis and meiosis?

A
  • no of divisions
  • no of cells produced
  • no of chromosomes in daughter cells
  • pairing of homologous chromosomes
  • crossing over
  • splitting of genetic material
  • function
  • genetic differences in daughter/parent cells
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9
Q

What are the two types of spermatogonium?

A

Type A: proliferate by mitosis

Type B: undergo meiosis

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10
Q

What is the process of spermatogenesis?

A
  • spermatogonium become primary spermatocytes
  • primary spermatocytes undergo the first meiotic division to become secondary spermatocytes
  • secondary spermatocyte undergo the second meiotic division to form spermatids
  • spermatids undergo spermiogeneis to become mature spermatozoa
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11
Q

What are the three stages of oogenesis and spermatogenesis?

A

Mitotic proliferation
Meiotic division
Cell remodelling

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12
Q

How long does spermatogenesis take?

A

Around 74 days

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13
Q

When does a primary oocyte complete its first meiotic division?

A

A day before ovulation

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14
Q

What occurs in spermiogenesis?

A
  • Golgi forms acrosomal vesicle and then acrosome which covers the head of the sperm
  • nucleus condenses
  • distal centriole migrates out to membrane and forms the flagellum, mitochondria migrate to proximal part of flagellum
  • cytoplasm ejected as a residual body
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