Solution- Principle of Inheritance Test-2 Class 12 Notes | EduRev

Class 12 : Solution- Principle of Inheritance Test-2 Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-03 
CLASS - XII BIOLOGY (Principle of Inheritance)
[ANSWERS] 
Ans1. The physical or chemical agents that causes mutations are called mutagen eg x-rays, 
CNBr etc. 
Ans2. fourteen. 
Ans3. Antirrhium majus which shows incomplete dominance in flower colour. 
Ans4. i) Turner syndrome – XO females containing 45 chromosomes & lacking one X-chr .
ii) Klinefilter syndrome XXY males containing 47chr, one extra X-chromosome in
males.
Ans5. The analysis of family history about inheritance of a particular trait in several 
generations of a family is called pedigree Analysis. It provides a strong tool which is 
utilized to trace inheritance of specific trait or abnormality or disease.  
Ans6. The presence of more then two alleles of a trait is called multiple alleles e.g. in 
human beings four types of blood groups are recognized and there different alleles 
I
A
 I
B 
& I
O 
of a gene determines the phenotype of four blood groups.  
Ans7. In human beings, it was found that all the 
females bear a pairs of X-chromosome 
while males have one X-chr & also one Y-chr 
which is comparatively smaller in size.   
Thus in a cross between male & female 
there is equal probability of males & 
females in progeny & sex is determined by 
presence of a Y-chr. if Y-chr is present it is male otherwise it is a female. 
XX x
X
X
XY
X
Y
XX
female
XY
male
XX
female
XY
male
Page 2


CBSE TEST PAPER-03 
CLASS - XII BIOLOGY (Principle of Inheritance)
[ANSWERS] 
Ans1. The physical or chemical agents that causes mutations are called mutagen eg x-rays, 
CNBr etc. 
Ans2. fourteen. 
Ans3. Antirrhium majus which shows incomplete dominance in flower colour. 
Ans4. i) Turner syndrome – XO females containing 45 chromosomes & lacking one X-chr .
ii) Klinefilter syndrome XXY males containing 47chr, one extra X-chromosome in
males.
Ans5. The analysis of family history about inheritance of a particular trait in several 
generations of a family is called pedigree Analysis. It provides a strong tool which is 
utilized to trace inheritance of specific trait or abnormality or disease.  
Ans6. The presence of more then two alleles of a trait is called multiple alleles e.g. in 
human beings four types of blood groups are recognized and there different alleles 
I
A
 I
B 
& I
O 
of a gene determines the phenotype of four blood groups.  
Ans7. In human beings, it was found that all the 
females bear a pairs of X-chromosome 
while males have one X-chr & also one Y-chr 
which is comparatively smaller in size.   
Thus in a cross between male & female 
there is equal probability of males & 
females in progeny & sex is determined by 
presence of a Y-chr. if Y-chr is present it is male otherwise it is a female. 
XX x
X
X
XY
X
Y
XX
female
XY
male
XX
female
XY
male
Ans8. 
i) Smooth seed & red flower     =3
ii) Smooth seed & white flower =3
iii) Rough seed & red flower =1 
iv) Rough seed & white flower   =1
Ans9.i) Test cross. 
Ans9.ii) 
Ans9. iii) Principle of Independent Assortment – Acc to which, in the inheritance of 
contrasting characters the factors of each pair of character segregate 
independently of the factors of the other pair of characters.   
Ss Rr
x
Ssrr
smooth seed &
Red flower
smooth seed &
White flower
SR
Sr sR
sr SR sr
SSRr
smooth & red
SSrr
smooth & white
SsRr
smooth & red
Ssrr
smooth & white
SsRr
smooth & red
SSrr
smooth & white
ssRr
rough & red
ssrr
rough & white
SR Sr sR sr
SR
sr
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