61. Which factor in nature causes discontinuous Variation in a population ?
A. Recombination
B. Shufflng of parental genes
C. Mutation
D. Geneflow
Answer : Option C
62. This is reversal of mutation
A. Spontneous mutation
B. Zygotic mutation
C. Back mutation
D. Recessive mutation
Answer : Option C
63. Which condition among the following is lethal ?
64. State the cause of Philadelphia syndrome
A. Deletion from the long arm of chromosome number 20
B. Duplication in long arm of chromosome number 20
C. Deletion from the long arm of chromosome number 22
D. Deletion from the short arm of chromosome number 22
Answer : Option C
65. which statement is incorrect regarding gene mutation
A. Mutations may be gradual or they may not be induced.
B. Mutation is an evolutionary agent
C. Any gene can undergo mutation
D. Mutated gene is harmful to the individual
Answer : Option A
66. What happens to excessive phenylalanine accumulation in the blood of phenylketonuria patient ?
A. Get deposited on synovial membrane
B. excreted in urine
C. Get deposited in storage organs
D. All of the above
Answer : Option B
67. Name the enzyme needed for the following biochemical reaction Tyrosine ???? enzyme Melanin
68. Which is very common method to study Human Karyotype ?
A. Blood culture method
B. Tissue culture method
C. Pedigree method
D. Statistical method
Answer : Option A
69. "Large thick and Swollen tongue and droping lips"----- are the symptoms of which genetical disorder
A. Autosomal aneuploidy
B. Trisomy of 21st chromosome
C. Down’s syndrome
D. Total number of chromosomes become 47
Answer : Option C
70. Name the disorder caused by trisomy of sex chromosomes.
A. Down’s syndrome
B. Kline felter’s syndrome
C. Turner’s syndrome
D. Edward’s syndrome
Answer : Option B