Biology
1. Which one is a SEX LINKED TRAIT?
A. Blindness
B. Deafness
C. Hemophilia
D. Myxodema
2. Number of autosomes in human sperms
A. 11
B. 22
C. 44
D. 45
3. Which one is a TEST CROSS?
A. Tt × Tt
B. TT × Tt
C. TT × TT
D. Tt × tt
3. The term 'gene' refers to
A. Sequence of amino acids in protein
B. A linkage group
C. A part of RNA
D. A portion of DNA
4. Gene mutation is caused by
A. Reproduction
B. Linkage
C. Change in the sequence of nitrogenous base
D. Change in the sequence of genes in DNA
5. Which of the following diseases is sex linked?
A. Colour blindness
B. Malignancy
C. Hepatitis
D. Leukemia
6. The character of organisms is said to be sex linked when its gene is carried on
A. Y - chromosomes
B. X - chromosome of male or female
C. X and Y chromosomes
D. A particular autosome
7. Two allelic genes are located on
A. The same chromosomes
B. Two homologous chromosomes
C. Two non - homologous chromosomes
D. Any two chromosomes
8. The genetic code was discovered by
A. G. Gamow
B. H. G. Khorana
C. Watson and Crick
D. M. Nirenberg
9. A colour blind man marries the daughter of a colour blind person. Then in their progeny
A. None of their daughters are colour blind
B. All the sons are colour blind
C. All the daughters are colour blind
D. 50% sons are colour blind
10. Conjoined twins are also known as
A. Fraternal twins
B. Siamese twins
C. Dizygotic twins
D. None of the above
11. Difference in the twins suggest
A. Incomplete dominance
B. That phenotype is influenced by many genes
C. That single gene may produce multiple effects
D. That they develop from two different eggs
12. Inheritance of ABO blood group system is an example of
A. Multiple allelism
B. Partial dominance
C. Epistasis
D. Dominance
Answer-:
1 - C
Hemophilia A, also called factor VIII deficiency or classic hemophilia, is a genetic disorder caused by missing or defective factor VIII, a clotting protein
The X and Y chromosomes are called sex chromosomes. The gene for hemophilia is carried on the X chromosome
Hemophilia is inherited in an X-linked recessive manner
2 - B
3 - D (Pehla)
3 - D (Doosra)
4 - D
5 - A
Colour blindness is not a form of blindness
It is inability to differentiate between some specific colours
Most common form of colour blindness is known as red/green colour blindness and most colour blind people suffer from this
6 - B
7 - B
8 - D
Nirenberg was awarded NOBEK PRIZE along with HAR GOVIND KHORANA, ROBERT HOLLEY for "GENETIC CODE INTERPRETATION"
9 - D
10 - B
11 - D
12 - A
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