<span class='text_page_counter'>(1)</span><div class='page_container' data-page=1>
,.
sa
GIA.O DVC
vA DAo
T~O
BENTRE
DE TID CHON HOC SINH GI<:'n
cAp
TiNH LOP 9
TRUNG HOC
co
sa -
NA.M HOC 2018 - 2019
Mon : SINH HOC
Ngay thi: 27/02/2019
ThOi gian : 150 phut (khong k~ phat d~)
Call
1. (4,0 di~m)
a) Hay phat
bieu
nQi dung quy luat phan li
doc
l~p. f)i~u
kien nghiem
dung
cua quy lu~t
phan
li dQcl~p la gi?
b) Giai thich tai sao kh6 c6 th€ tim
ducc
2 nguoi c6 ki€u gen gieng het nhau
tren trai dfrt
,
ngoai tnr tnrong hop tre sinh doi cung tnrng?
c) Thuc hien phep lai P:
8'
AaBbDd x
~
AaBbdd. Bi~t m6i gen quy dinh mot
tinh trang, gen trQi la trQihoan toan
o
Ha
y
xac dinh:
- S6 loai kieu gen va s6 loai kieu hinh (]
Fl.
- Ti 1~kieu gen (]
Fl
giong kieu gen cua b6.
- Ti 1~kieu hinh (] F
1
khac kieu hinh cua me,
Call
2. (4,0 di~m)
Co th€ lai F
1
chua c~p gen Bb
,
m6i gen d~u c6 90 chu ki
xoan,
Gen B c6
cy
1~
<i>AlG</i>
=
1
/
4, gen b c6 X
=
721 nucleotit. Cho rang gen b xufrthien la do gen B bi dQt
bien tao thanh.
a) Hay cho bi~t day la dQtbi~n gen thuQcd~ng nao?
b) Khi c~p gen Bb
t\l'
nhan do
i
thi moi truang nQibao phai cung cfrpbao nhieu
nucleotit m6i lo~i?
c) Theo Ii thuy~t, chu6i axit amin do gen b wa t6ng hgp xong c6 bao nhieu
axit amin?
.
Call
3. (4,0 di~m)
Bi~t r&ngm6i gen quy dinh mQttinh tr~ng va cac gen phan Ii dQc l~p.
d
ca
chua, ti~n hanh hai phep lai nhu sau:
<i>- Phep lai 1: lai gifra cay ca chua qua do</i>
,
trcmv6i cay ca chua qua do
,
dai thu
dugc dai con g6m 89 cay qua do
,
trcmva 29 cay qua yang
,
trcm.
<i>- Phep lai 2: lai gifra cay ca chua qua do</i>
,
trcmv6i cay ca chua qua yang, tron
thu dugc dai con g6m 119 qua do
,
tron; 120 qua yang
,
tron; 40 qua do
,
dai va 39 qua
vang,dai.
a) Hay bi~n lu~n va vi~t sa d61ai cho m6i phep lai.
b)
d
phep lai 1, Ifryng~u nhien 3 cay (] F
1,
xac sufrt dugc 2 cay Yang
,
tron
chi~m ti 1~bao nhieu?
Call
4. (3,0 di~m)
.
</div>
<span class='text_page_counter'>(2)</span><div class='page_container' data-page=2>
Cau 5. (5,0 di~m)
d
mot ca the dong v~t
,
co
3
t€ bao sinh
due
<i>sa</i>
khai cung ti€n
hanh
nguyen
phan mot s6 IAnbang nhau
,
sau do cit ca cac t€ bao con d€u
buoc
vao giam phan
hinh thanh giao
tu.
Ca hai qua trinh phan bao nay doi hoi moi tnrong cung cAp 1512
nhi€m sic the dan
,
trong do s6 nhi€m sic the dan cung cAp cho qua trinh giam phan
nhieu han s6 nhi€m sic the dan cung cAp cho qua trinh nguyen phan la 24.
a)
Xac
dinh s6 Ian nguyen phan cua t€ bao.
b) Co bao
nhieu
giao nr
duoc
tao thanh sau qua trinh giam phan?
c) S6 nhiem sic the
(y
ki sau I va ki sau II cua qua trinh giam phan
(y
m6i t€
bao la bao
nhieu?
d) T6ng s6 nhiem sic the trong cac t€ bao con
(y
ki giira Ian nguyen phan cu6i
cung la bao
nhieu?
</div>
<span class='text_page_counter'>(3)</span><div class='page_container' data-page=3>
---HET---t.
<i>sa</i>
GIAo
Dl)C
vA BAo
T~O
BENTRE
HUONG
DAN
cHAM
THI CHQN HQC SINH GIOI
cAP
TiNH LOP 9
TRUNG HQC
co
<i>sa -</i>
NAM HQC 2018 - 2019
Mon : SINH HQC
<i>Ngay thi: 27/02/2019</i>
1
4,0
di~m
2
4,0
di~m
3
4,0
di~m
a)- NQidung: Cac e~p nhan to di truyen da phan ly dQel~p trong qua trinh
phat sinh giao tl1 0,5
- Di~u kien: Cac e~p alen quydinh cac e~p tinh trang khac nhau phai nam
..
.!~~~
m
~
~
~
.
~~P.
_
~~i.~~
~A~
.
!
~
..
t.~~
~
~
..
~?~~~~~
._
~~~~
_ ___ _._
.
:
._
_._
.
.
_
<i>Q.</i>
<i>~</i>
<i>_</i>
<i>?</i>
<i>_</i>
<i>__ __ .</i>
b) -
<i>a</i>
nguoi: 2n = 46 NST => co 23 cap NST 0,5
=> s6 bien di t6
hop
rna
mot
cap b6 my co th~
410
ra la eire ki IOncu th~
223x 223= 246kieu hQPillkhac nhau. 0,5
1-· ::::- ::; ~ ::::: :::: : ::'::.•,..: :::::..:- : : - - - -- - - -- - - - --.-.-.-..- - -+---.-- ---- - -..--..-- -- -.-.
c) P:
0
AaBbDd x ¥AaBbdd
- se
loai kieu gen
<i>a</i>
FI:3 x 3 x 2 = 18
- S6 loai kieu hinh
<i>a</i>
FI:2 x 2 x 2
=
8
- Ti l~ kieu gen
<i>a</i>
FIgi6ng kieu gen cua b6 (AaBbDd)
<i>2/4 x 2/4 x 1/2</i>
=
<i>1/8</i>
a)
-Tong
so nucleotit cua m6i gen: N = 90 x 20 = 1800 (nu) 0,25
- s6 nucleotit m6i loai cua gen B:
<i>AlG =</i> 11<i>4;rna A + G = N/2 = 180012</i>= 900 (nu)
=> A = T = 180 (nu); G = X = 720 (nu). 0,25
- S6 nucleotit m6i loai cua gen b:
<i>X = 721 rna A + X = N/2 = 1800/2 = 900 (nu)</i>
=> A = T = 179 (nu); G = X= 721 (nu). 0,25
- So sanh s6 nucleotit rung loai cua gen B va b:
+ T6ng s6 nucleotit cua 2 gen bang nhau (1)
+Gb-GB=721-720=1;Ab-AB=179-180=-1 (2) 0,25
I:L!
D
l
,
y.~
.
(~
,
~
?:
A~~g
.
!~!'ly
_.
!~~
~._~_.I.!?~~_g_.~~p_.9
.
}
.
~~p.
__
~.~:. __.._
_.._ .
2
:
_
~
.
. _
_ _.
b) - Tong so nu eua e~p gen Bb:
+ ABb= AB+ Ab = 180 + 179 = 359 (nu) 0,25
+ Gsb= Gs + Gb = 720 + 721 = 1441 (nu) 0,25
- S6 nu m6i lo~i moi truemg eung dp:
=> Amt= Tmt= ABb(21 -1) = 359 (nu) 0,5
Gmt= Gmt= GBb(21-1) = 1441 (nu) 0,5
-
c)
·
·
··
S6
·
~utro
·
ng
·
pii~~
-
tfrmARN
-
do
·
ge~
-·
b
·
t6ngh9P:
- ---
.
---
- .
.
-
-
---
.----.-.-..
-
.. ---..--.
.
NARN=Nb:2 = 1800 : 2 = 900 (nu) 0,25
- S6 bQba = 900 : 3 = 300 bQba. 0,25
=> s6 axit amin = 300 - 1 = 299 (aa). 0,5
Cau
a) - Xae dinh tinh trQi l~n.
+
a
phep lai 1: P: d6 x d6 -7 FI89 qua d6 : 29 qua yang ;:::3 1
=>
qua d6 la trQi so v6i qua yang. Quy u6e: A:d6; a: yang 0,25
+
a
phep lai 2: P: tron x tron -7 FI(119 + 120) tron : (40 + 39) dai;:::
3 1
=>
qua tron la trQi so v6i qua dai. Quy u6e:B : tron; b: dai. 0,25
*
Phep lai 1:
+ d6 x d6 7 3 d6 : 1 qua yang 7 Ki~u gen P: Aa x Aa 0,25
+ tron x dai 7100% tron 7 Ki~u gen P: BB x bb. 0,25
=>Ki~u gen eua b6 my la d6,tron (AaBB) va d6, dai (Aabb)
- Sa d6 lai: P: AaBB x Aabb
Di~m
NQi dung
- Ti l~ kieu hinh
<i>a</i>
FIkhac kieu hinh cua my:
<i>1 - (3/4</i> x <i>314</i>x 112)
=
<i>23/32</i> <i>0,5</i>
'---' _.._._ _.._ .
0,5
0,5
Ghi chii
0,5
</div>
<span class='text_page_counter'>(4)</span><div class='page_container' data-page=4>
---I,.
,
.
*
Phep lai 2:
+ do x vang ~ FI(119 + 40) do: (120 + 39) qua vang = 1 1
~ Ki€u gen cua P: Aa x aa
+ tron x tron ~ FI(119 + 120) tron : (40 + 39) dai = 3 : 1
~ Ki€u gen cua P: Bb x Bb
=> Ki€u gen cua b6, me dem do,tron (AaBb) va vang, tron (aaBb)
- So'db lai:P: AaBb x aaBb
Gp : AB, aB, Ab, ab / aB, ab
FI: 1 AaBB : 2 AaBb : 1 Aabb : laaBB : 2 aaBb : 1 aabb. 0,5
KH: 3 qua do,tron : 1 qua do,dai : 3 qua vang,tron : 1 qua vang, dai 0,5
.
bjTAyjc~Y
·
6F
;:
·
dugc2
·
··
c~y
·
v~ng
:
·
tr6n
·
:3:(i
7
4j2:
···
{3
j
4);;;;9
7
64:
·
····
·
··
·
·
···
··
·
··
0·;
·
5
·
·
·
·
···
-
-
.
Gp: AB, aB / Ab,ab
FI 1 AABb: 2 AaBb: 1 aaBb
KH: 3 qua do,tron 1 qua vang, tron
0,5
0,5
Neu HS chi
neu diroc
ten khong
neu co
ch~
(tning 1 ten
dQt bien x
0,25 d).
- M6i cach~
x 0,75 d
4
3,0
di~m
DQtbien kieu di bQi (2n+ I) hoac the da bQi(3n) hoac dQtbien I~p dean.
<i>- Co' ch~ hinh thanh (2n+ 1): Trong giam phan II</i>
<i>a</i>
b6 hoac me c~p NST
mang gen A khong phan li ~ giao tll n+ 1 (AA), giaoillnay k~t hop voi
giaoilln (A) ~ h9P
nr
2n+ 1 (AAA).
<i>- Co' ch~ hinh thanh 3n: Trong giam phan II</i>
<i>a</i>
b6 hoac me cit ca cac c~p
NST khong phan Ii ~ giao tll 2n (AA),giaoillnay k~t hop voi giaoill
binh thuong n (A) ~ hopill3n (AAA).
<i>- Co' ch~ hinh thanh dQtbi~n I~p doc;tn:do mc dQng Cllacac tac nhan v~t</i>
If,h6a h9C ~ du truc CllaNST
<i>bi</i>
pha va lam I~pdoc;tnmang gen A. Giao
illchua I~p doc;tn(mang 2 alen A) k~t hqp v6'i giao tll binh thuemg A ~
ki€u gen AAA.
0,25
0,25
1,0
1,0
1,0
5
5,0
di~m
a) - G9i x la so NST dan moi truemg cung cap cho nguyen phan.
y la s6 NST dan moi truemg cung c~p cho giam phan.
k la s6 d9t nguyen phan Cllam6i t~ bao (k nguyen duang)
-Theod€:x+y=1512 (I)
va y-x=24 (2)
CQng(1) va (2): 2y = 1536 =>Y= 768 va x = 744.
- BQNST Cllaloai la:
- Theo bai ta c6: x = 3.2n (2k - I); Y = 3.2n.2k
- Ma: y - x = 24 <=> 3.2n.2k - 3.2n.(2k-l) = 24
=> 2n = 24 : 3 = 8
Th~ 2n = 8,Y = 768 vao y = 3.2n.2k=> k = 5
V~y s6 IAnnguyen phan Cllam6i t~ bao la 5 0,5
b)=N~ii
·
l~t€b~osInhd\ic
·
·
d\fc
-
;;;;
;
-
3
-
x
-
ifx4
-
;;;;
--
384
-
giao
-
tfr
..
_
_
._ _.
.
_
·
-
-
--
0;
-
5
---
-
-
.
_
-
._
-_
-
.
_ -
.
- N~u la t~ bao sinh d\lc cai => 3 x 32 x 1 = 96 giao tll 0,5
···
cj=S6NSTtrong
·
k§ sau"Icliagi~mphiin6m6ri€
-
b~o
·
··
j~
-
8
-
NSTk6p
·
··
·
·
-·
0;
-
5···
-- S6 NST trong
Icy
sau II Cllagiam phan
<i>a</i>
m6i t~ bao hi 8 NST dan 0,5
-
d"j"T6ngs6NSTtrongc~ct~b~o&ki
·
gifraciia
-
iln
·
ngu
-
y€n
·
ph~n
·
cu6Tciing
: .
.
_
_
.
.
--- T6ng s6 t~ bao
<i>a</i>
ki gifra CllaIAnnguyen phan thu 5 = 3 . 25 -I= 48 t~ bao
=>T6ng s6 nhi€m s~c th€ = 8 .48 = 384 NST kep
0,25
0,5
0,25
0,5
0,5
0,5
</div>
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