Meiosis Flashcards

1
Q

Qué es la meiosis?

A

División celular de rep sexual que reduce los cromosomas en gametos

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2
Q

Cel haploides (gametos) N

A

23 cromosomas, tiene 1 copia de cada tipo de cromosoma

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3
Q

Cel diploide 2n

A

23 pares de cromosomas = 46, humano, 2 copias de cada cromosoma

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4
Q

Cel sexuales

A

Vienen de cel diploides generando haploides para unirse y crear in cigoto diploide

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5
Q

Fases de meiosis

A

Meiosis 1
Meiosis 2

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6
Q

Profase 1

A

Fase más larga, intercambio de cromosomas.

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7
Q

Inicio de la meiosis, cuántes cromatides hay?

A

Tenemos 96 cromatides es decir 46 cromosomas

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8
Q

Fases de Profase 1

A

Leptoteno, zigoteno, paquieteno, diploteno, diacinesis

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9
Q

Qué ocurre en leptoteno?

A

Condensan cromosomas y se preparar

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10
Q

Qué ocurre en Zigoteno?

A

Sinapsis entre comosomas homologas, unen en quiasmas, regulados por complejos sinaptonemicos
UNEN

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11
Q

Qué ocurre en Paquiteno?

A

Recombinacion de cromosomas en quiasmas, forma un tetramero
COMBINAN

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12
Q

Qué ocurre en Diploteno?

A

Se separan cromosomas

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13
Q

Qué ocurre en Diacinesis?

A

Se continua condensando el cromosomas pero la membrana desaparece para que el huso meiotico se forme y se formen los cromosomas en metafase

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14
Q

Metafase 1

A

Los cromosomas homologos se linean en el medio

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15
Q

Anafase 1

A

Separación de 2 cromosomas

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16
Q

Telofase 1

A

Se forma la envoltura

17
Q

Citosinesis 1

A

23 cromosomas diploides y 46 cromatidas, es decir la mitad

18
Q

Profase 2

A
19
Q

Citosinesis 2

A

23 cromosomas, 23 cromatidas haploides

20
Q

Gametogenesis

A

Tenemos cel germinales diploides, se generan

21
Q
A

4 cel no identicas, haploides, 23 cromosomas