8/12/2019 CD 13 Meiosis 01

1/6

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

8/12/2019 CD 13 Meiosis 01

2/6

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

8/12/2019 CD 13 Meiosis 01

3/6

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

8/12/2019 CD 13 Meiosis 01

4/6

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

1

8/12/2019 CD 13 Meiosis 01

5/6

%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

8/12/2019 CD 13 Meiosis 01

6/6

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.