121. A self-fertilizing trihybrid plant forms

A 8 different gametes and 64 different zygotes
B 4 different gametes and 16 different zygotes
C 8 different gametes and 16 different zygotes
D 8 different gametes and 32 different zygotes
Answer :   8 different gametes and 64 different zygotes
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122. Disease resistant varieties can be produced by

A Crossing a plant with wild variety
B Treating with colchicine
C Crossing with hormones
D Treating with low temperature
Answer :   Crossing a plant with wild variety
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123. Genetic drift operates in

A Small isolated population
B Large isolated population
C Fast reproductive population
D Slow reproductive population
Answer :   Small isolated population
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124. In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in $${F_1}$$ generation, pink flowers were obtained. When pink flowers were selfed, the $${F_2}$$ generation showed white, red and pink flowers. Choose the incorrect statement from the following:

A This experiment does not follow the principle of dominance
B Pink colour in $${F_1}$$ is due to incomplete dominance
C Ratio of $${F_2}$$ is $$\frac{1}{4}$$ (Red): $$\frac{1}{2}$$ (Pink): $$\frac{1}{4}$$ (White)
D Law of Segregation does not apply in this experiment
Answer :   Law of Segregation does not apply in this experiment
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125. How many gametes are produced in F: generationof a trihybrid

A 3
B 4
C 8
D 16
Answer :   8
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126. Which one is the incorrect statement with regards to the importance of pedigree analysis?

A It helps to trace the inheritance of a specific trait
B It confirms that DNA is the carrier of genetic information
C It helps to understand whether the trait in question is dominant or recessive
D It confirms that the trait is linked to one of the autosome
Answer :   It confirms that DNA is the carrier of genetic information
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127. A cross used to ascertain whether a dominant is homozygous or heteroxygous

A Reciprocal
B Back cross
C Test cross
D Monohybrid
Answer :   Test cross
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128. When a tall plant with round seeds (TTRR) is crossed with a dwarf plant with wrinkled seeds (ttrr), the fi generation consists of tall plants with rounded seeds. How many types of gametes Fj plant would porduce

A One
B Three
C Four
D Eight
Answer :   Four
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129. A pure tall plant can be differentiated from a hybrid tall plant

A By measuring length of plant
B By spraying gibberalins
C If all plants are tall after self-pollination
D If all plants are dwarf after self-pollination
Answer :   If all plants are tall after self-pollination
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130. Differentiation of organs and tissues in a developing organism, is associated with

A Developmental mutations
B Differential expression of genes
C Lethal mutations
D Deletion of genes
Answer :   Differential expression of genes
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