Chapter 11 Flashcards

1
Q

Sexual Life Cycle is made up of

A

Meiosis and Fertilization

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2
Q

Dipolid cells have

A

2 sets of chromosomes

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3
Q

Haploid cells have

A

1 set of chromosomes

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4
Q

How are diploid cells produced

A

when the zygote first undergoes mitosis, it produces diploid cells

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5
Q

How are haploid cells produced

A

when diploid cells undergo meiosis, it produced haploid cells

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6
Q

Meiosis includes _ rounds of division, including ___ _, and ___ _

A

2, Meiosis 1, Meiosis 2

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7
Q

Synapsis is during ___ _, includes formation of ___ ___

A

Prophase 1, Synaptonemal Complexes

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8
Q

Formation of Synaptonemal Complexes is also known as ___ or ___

A

tetrad, or bivalent

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9
Q

Crossing over is also known as the

A

genetic recombination between sister chromatids

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10
Q

The site of crossing over

A

Chiasmata

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11
Q

During metaphase I, the paired homologues
move to the

A

metaphase plate and become
oriented with homologues of each pair
attached to opposite poles of the spindle

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12
Q

In mitosis, homologues behave

A

independently

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13
Q

During anaphase I, homologues

A

are pulled to
opposite poles for each pair of chromosomes

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14
Q

In mitosis, sister chromatids are pulled

A

to opposite poles

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15
Q

Describe Telophase 1

A

Nuclear envelope re-forms around each daughter nucleus

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16
Q

Meiosis 2 resembles a

A

mitotic division

17
Q

Prophase II

A

nuclear envelopes dissolve and new spindle
apparatus forms

18
Q

Metaphase II

A

chromosomes align on metaphase plate

19
Q

Anaphase II

A

sister chromatids are separated from each other

20
Q

Telophase II

A

nuclear envelope re-forms around 4 sets of
daughter chromosomes; cytokinesis follows

21
Q

Final result of Meiosis 2

A

Four cells containing haploid sets of chromosomes

22
Q

Meiosis is characterized by 4 features

A

1.Synapsis and crossing over
2.Sister chromatids remain joined at their centromeres throughout
meiosis I
3.Kinetochores of sister chromatids attach to the same pole in
meiosis I
4.DNA replication is suppressed between meiosis I and meiosis II

23
Q

Nondisjunction

A

failure of chromosomes to move to opposite
poles during either meiotic division

24
Q

Aneuploid gametes

A

gametes with missing or extra
chromosomes

25
Q

Most common cause of spontaneous abortion in humans

A

Errors