Download - CD 13 Meiosis 01
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BIOL 1406 Discussion Questions: Meiosis and Sexual Life Cycles
1. Dra la!eled dia"ra#s s$oin" t$e 10 sta"es of meiosisfor a diploid cell$ere%&'6. (se ) different s$a*es to re*resent t$e different c$ro#oso#es in eac$ set+
and use % different colors to re*resent t$e % sets of c$ro#oso#es. Ma,e sure you
s$o t$e nu#!er+ s$a*e+ color and location of t$e c$ro#oso#es at eac$ sta"e ofdi-ision. e#e#!er+ in so#e sta"es t$e c$ro#oso#es ill !e du*licated and in
so#e sta"es t$ey ill not !e du*licated. /lso include t$e s*indle a**aratus and
nuclear #e#!rane $en a**ro*riate.
%. Dia"ra# and descri!e t$e ty*ical ani#al life cycle. Be sure to indicate $ic$ sta"es
are $a*loid and $ic$ are di*loid. /lso indicate $ere #itosis occurs+ $ere
#eiosis occurs+ and $ere fertiliation occurs.
). Dia"ra# and descri!e t$e eu,aryotic life cycle $ere a #ulticellular $a*loid
"eneration alternates it$ a #ulticellular di*loid "eneration alternation of
"enerations2. Be sure to indicate $ic$ sta"es are $a*loid and $ic$ are di*loid./lso indicate $ere #itosis occurs+ $ere #eiosis occurs+ and $ere fertiliation
occurs.
4. Identify and descri!e at least ) ays #eiosis differs fro# #itosis.
3. Descri!e t$e *rocesses of inde*endent assort#ent and crossin" o-er+ and ex*lain
t$eir !iolo"ical si"nificance.
6. Descri!e t$e e-olutionary si"nificance of sexual re*roduction.
. Six centro#eres are o!ser-ed in a *ro*$ase I cell fro# anot$er s*ecies of insect.
a. 5o #any *airs of c$ro#oso#es does t$is or"anis# contain
b. For each stage of meiosis, indicate the number of centromeres you would
expect to find and the number of copies of chromosomes attached to each
centromere.
Sta"e of #eiosis:
&u#!er of centro#eres
-isi!le
&u#!er of c$ro#oso#e
co*ies attac$ed to eac$
centro#ere
/na*$ase I
7ro*$ase II
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8.Meiosis I is so#eti#es called a reduction di-ision9 #eiosis II is so#eti#es called an
euational di-ision. ;$y
cyto,inesis
Mitosis
Meiosis I
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Meiosis II
1%.
TABLE: Mitosis vs. Meiosis
Inter*$ase 7ro*$ase Meta*$ase /na*$ase =elo*$ase
Mitosis? MeiosisSi#ilarities
Mitosis?Meiosis
Differences
13.If the amount of DNA in a somatic cell equals 4 picogramsduring G1of interphase,
then how much DNA is present in the cell during each phase of mitosis and meiosis?
/#ount of
D&/ in:Inter*$ase 7ro*$ase Meta*$ase /na*$ase =elo*$ase
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Mitosis
Meiosis I
Meiosis II
.
14.How do the similarities in prophase of mitosis and meiosis compare with thesimilarities in telophase of mitosis and meiosis?
15. At what stage(s) does/do most of the differences among mitosis, meiosis I, and
meiosis II occur? Why do these differences exist?
16. =$e D&/ content of a di*loid cell in t$e @1*$ase of t$e cell cycle is #easured. If
t$e D&/ content is x+ t$en t$e D&/ content of t$e sa#e cell at #eta*$ase of #eiosis Iould !e AAAAAAAA.
1. =$e D&/ content of a di*loid cell in t$e @1 *$ase of t$e cell cycle is #easured. If
t$e D&/ content is x+ t$en t$e D&/ content at #eta*$ase of #eiosis II ould !eAAAAAAA.
18. ;$ic$ of t$e folloin" ould not !e considered a $a*loid cell
a2dau"$ter cell after #eiosis II!2"a#ete
c2dau"$ter cell after #itosis in "a#eto*$yte "eneration of a *lant
d2cell in *ro*$ase I
e2cell in *ro*$ase II
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%0.
=$e folloin" dia"ra#s s$o a di*loid cell it$ % c$ro#oso#es+ 1 and %. =$e
c$ro#oso#e deri-ed fro# t$e #ot$er is denoted #+ and t$e c$ro#oso#e deri-ed fro#t$e fat$er is denoted d.
a2 =$e *icture !elo s$os t$e end of #itosis?#eiosis I?#eosis II. Circle one.2
!2 =$e *icture !elo s$os t$e end of #itosis?#eiosis I?#eosis II. Circle one.2
c2 =$e *icture !elo s$os t$e end of #itosis?#eiosis I?#eosis II. Circle one.2
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d.2In $ic$ sta"e of #itosis or #eiosis does #ost of t$e reco#!ination occur
x*lain $y
=$is #aterial as created !y or ada*ted fro# #aterial created !y MI= faculty #e#!ers+ 7rofessor 5ael Si-e+
7rofessor =yler ac,s+ Dr. Claudette @ardel+ Introductory Biolo"y+ %004. Co*yri"$t E Fear2 7rofessor 5ael Si-e+7rofessor =yler ac,s+ Dr. Claudette @ardel.