1. What does "lac" refer to, in what we call the lac operon

A. Lactose
B. Lactase
C. Lac insect
D. The number 1,00,000
Answer :   Lactose
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2. A phenomenon which works opposite to the linkage is

A. Independent assortment
B. Crossing-over
C. Segregation
D. Mutation
Answer :   Crossing-over
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3. When two hybrids Ttrr and Rrtt are crossed, the phenotypic ratio of offspring shell be

A. 3:1
B. 1:1:1:1
C. 1:1
D. 9:3:3:1
Answer :   1:1:1:1
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4. A disease caused by an autosomal primary non-disjunction is :

A. Klinefelter's Syndrome
B. Turner's Syndrome
C. Sickel Cell Anemia
D. Down's Syndrome
Answer :   Down's Syndrome
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5. Which of the following is the most primitive ancestor of man

A. Homo habilis
B. Ramapithecus
C. Australopithecus
D. Homo meanderthalensis
Answer :   Ramapithecus
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6. Which of the following is important for speciation

A. Seasonal isolation
B. Reproductive isolation
C. Behavioural isolation
D. Tropical isolation
Answer :   Reproductive isolation
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7. Which of the popular variety of wheat has been developed by mutation

A. Triticale
B. Kalyan Sona
C. Sonalika
D. Sharbati Sonora
Answer :   Sharbati Sonora
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8. In Bonellia, all larvae are genetically and cytologically similar. In this worm male individuals live in the uterus of female. If a particular larva settle near proboscis of an adult female, it becomes a male individuals. If larva develops free in water it becomes

A. Male individuals
B. Female individuals
C. Intersex
D. Any of the above
Answer :   Female individuals
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9. Mendelian monohybrid ratio is

A. 1:2:1
B. 3:1
C. 9:3:1
D. 9:3:4
Answer :   3:1
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10. A normal woman whose father was albino, marries an albino man, what proportion of normal and albino are expected among their offsprings

A. All normal
B. 2 normal : 1 Albino
C. All albino
D. 1 normal: 1 Albino
Answer :   1 normal: 1 Albino
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