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Intro To Biochemistry And Genetics 🧬 > Meiosis > Flashcards

Meiosis Flashcards

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1
Q

What type of cells are produced by meiosis?

A

Haploid cells

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2
Q

Meiosis is a reduction division true or false

A

True

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3
Q

How many phases are there in meiosis?

A

2 stages meiosis i and meiosis ii

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4
Q

How many chromosomes are formed before meiosis I.

A

4n or 92

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5
Q

How many haploid gametes are produced after meiosis?

A

4

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6
Q

What are the phases of prophase i in order?

A

Leptotene, Zygotene pachytene Diplotene and diokenisis

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7
Q

What does crossing over entail

A

The exchange of alleles between two homologous chromosomes

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8
Q

What is an allele

A

Different forms of the same gene

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9
Q

What occurs during leptotene?

A

Condensation begins and chromosmeres begin to form

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10
Q

What is a synaptonemal complex?

A

The point at which homologous chromosomes are fused during synapses

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11
Q

What is a bivalent

A

Two fused homologous chromosomes

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12
Q

What is the result of crossing over?

A

Gene recombination

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13
Q

Where does crossing over occur?

A

In the chiasmata

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14
Q

What happens during Diplotene

A

The bivalent separates.
The chiasmata begins terminalization
The chiasma is the only part of the bivalent attached.

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15
Q

What is the distinguish factor of diakinesis ?

A

Terminalization of chiasmata and disappearance if synaptonemal complex

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16
Q

What are two forms of genetic variation

A

Independent assortment and crossing over

17
Q

What is associated with pachytene?

A

Further condensation and crossing over

18
Q

Why must the chromosomes be aligned during crossing over

A

In order for the portions to respond

19
Q

When does independence assortment occur?

A

Metaphase I

20
Q

What is the difference between Metaphase I of meiosis and metaphase in mitosis?

A

In mitosis sister chromatids are separated but in meiosis homologous chromosomes are separated

21
Q

What is disjunction and when does it occur?

A

It is the separation of homologous chromosomes
It occurs during anaphase I

22
Q

How many chromosomes are formed at the end of meiosis I

A

46

23
Q

What is the significance of meiosis?

A

Sexual reproduction and genetic variation

Intro To Biochemistry And Genetics 🧬 (2 decks)

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