Test: Inheritance and Variation
Test: Inheritance and Variation
Time: 2 Hours
Maximum Marks: 50
Section A – Multiple Choice Questions( 7 Marks)
1. Phenotypic ratio in incomplete dominance is:
a) 3:1 b) 1:2:1 c) 2:1:1 d) 9:3:3:1
2. A cross with recessive parent is called:
a) Back cross b) Test cross c) Dihybrid cross d) Monohybrid cross
3. Chromosomal theory was proposed by:
a) Mendel b) Darwin c) Sutton & Boveri d) Watson & Crick
4. Turner’s syndrome has:
a) XXY b) XO c) XXX d) XY
5. Law of dominance explains:
a) Mutation b) Dominant expression c) Crossing over d) Linkage
6. Find the mis match pair :-
a). Down’s syndrome = 44 + XY b).Turner’s syndrome = 44 + XO
c).Klinefelter syndrome = 44 + XXY d). Normal female = 44 + XXX
7.Chromosomal theory of inheritance was proposed by ................
a).Sutton and Boveri. b).Watson and Crick
c).Miller and Urey. d). Oparin and Halden
Section B – Answers in one sentence ( 5 Marks)
1. Define Gene.
2. Define Alleles.
3. Define Phenotype.
4. Define Homozygous.
5. Define Punnett square.
Section C – Short Answer (Any 6 out of 8) ( 12 Marks)
1. Define dihybrid cross.
2. What is heterozygous condition?
3. What are X-linked genes?
4.Give one example of autosomal recessive disorder.
5. Write a note on pleiotropy.
6.What is crossing over?
7.What are the reasons for Mendel’s success?
8. Define test cross with suitable example.
Section D – Detailed Answer (Any 6 out of 9) ( 18 Marks)
1. Justify that father determines sex of child.
2. Explain linkage and number of linkage groups in humans.
3. Explain law of dominance with example.
4. Explain dihybrid cross with phenotypic ratio.
5. Explain independent assortment with example.
6. Define test cross and state its significance.
7. Explain structure of chromosome.
8. Differentiate between test cross and back cross.
9. Explain chromosomal theory of inheritance.
Section E – Long Answer (Any 2 out of 4) (8 Marks)
1. State generalizations of Mendel’s experiments.
2. Explain Neo-Mendelism and gene interactions with examples.
3. Explain dihybrid cross with checkerboard method.
4. What is parthenogenesis? Explain haplo-diploid sex determination in honeybee.
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