1. Father of genetics is:

A. Mendel

B. Darwin

C. Muller

D. Bateson

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4. Sickle cell anaemia is:

A. Autosomal heriditary disease

B. Allosomic heriditary disease

C. Epistatic effect

D. Nutritional disorder

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5. In multiple allele system, a gamate has alleles:

A. One

B. Two

C. Three

D. many

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A. Paired factors

B. Dominance

C. Segregation

D. Independent assortment

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7. A gene influencing many traits is:

A. Additive

B. Pleiotropic

C. Epistatic

D. Supplementary

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8. A genetic disorder in Africans which reduces oxygen uptake is:

A. Phenylketonuria

B. Haemophilia

C. Colour blindness

D. Sickle cell anaemia

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9. Discontinous variations are due to:

A. Crossing over

B. Mutations

C. Segregation of chromosomes

D. Independent assortment

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10. Exchange of segments between non homologous chromososmes is called:

A. Crossing over

B. Inversion

C. Duplication

D. Translocation

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11. A couple has two girls. the probability of a third girl baby is:

A. 100%

B. 50%

C. 25%

D. 12.5%

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12. Sex chromososmes are also called:

A. Allosomes

B. Hetrosomes

C. Autosomes

D. Euchromosomes

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13. Dihybrid test cross is:

A. 1 : 1 : 1 : 1

B. 1 : 1

C. 9 : 3 : 3 : 1

D. 15 : 1

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14. Match the condition with chromosomal abnorm lity or linkage.

A. Colour blindness-- Y-linked

B. Erythroblastosis fetalis-- X-linked

C. Klinfelter's syndrome-- 44 + XXY

D. Down's syndrome-- 44 + XO

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15. Trisomy 21 is otherwise called:

A. Klinfelter's syndrome

B. Turner's syndrome

C. Sickle cell anaemia

D. Down's syndrome

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16. Variations occure during meosis due to:

A. Crossing over

B. Independent assortment

C. Linkage

D. Disjunction

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17. Polygenic inheritance occures in:

A. Human eye colour and sickle cell anaemia

B. Hair pigment in mouse and tongue rolling in humans

C. Human height and skin colour

D. ABO blood group in human

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18. Phenomenon of one gene controlling several phenotypes is;

A. Epistatsis

B. Pleiotropism

C. Codominance

D. Multiple allelism

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19. A human male produces sperms with genotypes AB, Ab, aB, and ab in equal proportions. What is the genotype of the person?

A. AA Bb

B. AA BB

C. Aa Bb

D. Aa BB

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20. Gene for right handedness is dominant over the gene for left handedness. Most probable genotypes of two right handed parents with left handed child is;

A. RR x rr

B. rr x Rr

C. RR x Rr

D. Rr x Rr

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21. Genes present on the same locus but having different expressions are:

A. Multiple alleles

B. Polygenes

C. Oncogenes

D. Codominants

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22. Individuals with blood group A has

A. Antigen A, antibody B

B. Antigen B, antibody A,

C. Antigen A, antibody b

D. Antigen A, no antibody.

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23. Ratio of 9:3:3:1 is due to:

A. Independent assortment of genes

B. Segregation of charecters

C. Crossing over of chromosomes

D. Homologous pairing between chromosomes

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24. An O-group child cannot have parents of blood groups:

A. B and B

B. A and B

C. O and O

D. AB and O

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25. Genes expressed only in homozygous state are:

A. dominant

B. recessive

C. codominant

D. mutated

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