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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