Student EDITION Variation

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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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Student EDITION Variation

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