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CHAPTER 15: VARIATION
Multiple Choice Questions
For questions 1 to 10 each question is followed by four alternative answer,A,B,Cor D.
Choose one correct answer for each question and blacken the corresponding space in your
objective answer
6.1 Une!st"nin# V"!i"tion In O!#"nis$s
6.% Une!st"nin# The C"uses O& V"!i"tion
6.' (e Respect&ul To)"!s One Anothe! *espite V"!i"tion
1. Which of the following examples are continuous variation ?
I Hand span
II Fingerprints
III Tongue rolling
IV Intelligence
A I and II
I and IV
! II and III
" II # III and IV
$.
From the dialogue a%ove# genetic factors occur during &&&&&&
I 'utrition
II (utation
III )andom fertilisation
IV !rossing over in meosis 1
A I and II
III and IV
! II # III and IV
" I # II # III and IV
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Teacher 3 4 What are the causes of variations ? 4
nisah ! " Variations can %e caused %oth %5 genetic factors and environmental factors 4 .
Teacher ! 4 -es # ver5 good 4 .
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6.
T5pe *f
Finger
prints!urves )ight +oops Whorl +eft +oops
'um%er of
students
1$ 17 8 9
TA+0 1:.1
A class of 8; students did an investigation of variation on t5pes of fingerprints among
them. The5 recorded the information and gathered the result in the ta%le 1:.1. What
t5pe of variation is shown.?
A !ontinuous variation
"iscontinuous variation
! ,enetic variation
" 0nvironmental variation
8.
Nu$+e! o&
ch!o$oso$es
Ch!o$oso$es
in,ol,e
-e
8 - @
An extra chromosomes (ale
"IA,)A( 1:.1
ase from diagram 1:.1 # which of the following diseases is caused %5 chromosomes
mutation in human ?
A "owns s5ndrome
Turners s5ndrome
! 2linefelters s5ndrome
" Al%inism s5ndrome
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9. Which of the following variation is influenced %5 environmental factors ?
A lood group
)hesus factor
! T5pe of earlo%e
" !olour of the sBin
C. What is meant %5 mutation ?
A !hanges to the chromosomes after fertilisation
!hanges to the chromosomes due to crossing over
! !hanges to the chromosomes due to recom%ination
" udden changes to the chromosomes %ecause of mutagens
1;. In an investigation carried out to investigate variation # the following characteristics are
o%tained 3
An example of the variation investigated is &&&..
A Intelligence
05e colour
! T5pes of fingerprint
" lood group
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No distinct differences
Has intermediate characteristic
Normal distribution graph obtained
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-t!uctu!e Ite$s
nswer all questions. #rite your answers in the spaces provided in the question paper.
6.1 Une!st"nin# V"!i"tion In O!#"nis$s
6.% Une!st"nin# The C"uses O& V"!i"tion
6.' (e Respect&ul To)"!s One Anothe! *espite V"!i"tion
1.
TA+01:.$
A+ilit/ to !oll toun#e 0!oup o& people
A%le to roll tongue D and )
/na%le to roll tongue and T
TA+0 1:.6
=a@ What is the t5pe of variation shown %5 the ta%le 1:.6 ?
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0!oup o&
people
P Q R T
Hei#ht !"n#e 1:1E1:: cm 1:7E17;
cm
171E17: cm 177E1
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T!"it T/pe o& ,"!i"tion
Height
Tongue )olling $ $arksG
=%@ ase from the investigation # what is meant %5 continuous variation ?
1 $arkG
=c@
=i@ /sing results from ta%le 1:.$# draw a histogram of num%er of people against the
height range =cm@.
=ii@ oint the midpoint of each %ar to draw a smooth curve .
=iii@ /sing results from ta%le 1:.6 plot a %ar graph of num%er of people against the
a%ilit5 to roll tongue. : $arks
G
(d) tate the factor that can cause this t5pe of variation for each trait stated.
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T!"its 3"cto!s th"t c"use ,"!i"tion
Height
Tongue )olling
$ $arks G
=e@ 0xplain how the students conducted the investigation to determine the t5pe of
variation in the height of people ? 6
$arksG
$.
"IA,)A( 1:.6
"iagram 1:.6 shows a group of children with a genetic disease due to mutation .
=a@ tate the genetic disease %ased on diagram 1:.6 . 1 $arkG
=c@ What is the t5pe of that mutation ? 1$arkG
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=d@ How man5 chromosomes do the children have ? 1 $arkG
=e@ (utation are caused %5 agents called mutagens .
,ive t)oexamples of mutagens .
$$arksG
= f @ How do mutagens caused mutation ? $ $arksG
= g @ Ta%le 1:.8 %elow shows genetic diseases caused %5 chromosome mutation.
Fill in the %lanB %5 using the word given .
Male Klinefelters syndrome Female acobs syndrome
!urners syndrome Male and Female
"isease
'um%er of
!hromosomes
!hromosomes
involved ex
= 88 > * @ A%sence of one sex
chromosome
= 88 > - @ An extra
chromosomes
TA+0 1:.8 8$arksG
Ess"/ Ite$s.
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1.
"IA,)A( 1:.8
T5pe of
finger
prints!urves )ight +oops Whorl +eft +oops
"IA,)A( 1:.:
"iagram 1:.8 and 1:.: shows two different variation among human %eings.
=a @ "etermine the t5pe of variation in "iagram 1:.8 and 1:.:. ,ive the reasons.
8 $arksG
=%@ =i@ What are the differences %etween continuous and discontinuous variation?
=ii@ tate the factors that cause variation in humans .
7 $arksG
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There are three sources of genetic factors in sexual reproduction events 3
C!ossin# o,e! during meiosis 1
Inepenent "sso!t$entduring meiosis
R"no$ &e!tilis"tion
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=c@ ase from the statement a%ove# explain the three sources of genetic factors
during sexual reproduction 1; $arksG
0nd *f uestions
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