Cht 13 Meiosis Flashcards

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0
Q

Metaphase 1 and 2

A

1)
Homo chromos line up at metaphase plate 2X2 (tetrads-4chromo)
2)
Lines up 1x1 in 2 different cells

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1
Q

Prophase 1 and 2

A

1) synapsis= homo. Chromo. Pair up
Recombination= (crossing over) in synapsis homo chromo break and swap places (why bros and sis don’t look alike)
Chiasmata= where homo chromos touch (where recombination occurs)
2) both cells go thru same way ^

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2
Q

Anaphase 1 and 2

A
1)
Homo chromosomes are pulled apart to opposite poles 
Sister chromatids are still connected
2)
Sister chromatids pull apart
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3
Q

Telophase 1 and 2

A
1) 
parents cell has 6 chromos
 2 daughter cells with 3 chromo =reduced the chromo numbers. 
2) 
4 haploid gametes
Each with 3 chromos
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4
Q

Spermatogenesis

A

Formation of sperm via meiosis.

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5
Q

Oogenesis

A

Formation of ova (eggs) via meiosis

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6
Q

Zygote

A

The single cell resulting from fusion of the sperm (23) with the ovum(23)
Each have 23 chromos.
Zygote=46 chromos

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7
Q

Cleavage

A

The zygote will go thru mitosis to form multi-called embryo.
Stays same size but cells get smaller.

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8
Q

Steps of zygote to an embryo

A

Morula (solid ball of cells) > blastula (hollow ball) < blastoceol (hollow center).
Gastrulation (gas burp/fart) (movement of cells) > blastopore (mouth or anus).
Gastrula : endoderm (inside gut) and ectoderm (outside tissue).

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9
Q
Ectoderm
Endoderm
Mesoderm
Blastopore 
Blastocoel
A
Skin
Lines the guts
Muscles
Mouth/anus
Body cavity
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