Some members of a photosynthetic plant species are genetically resistant to an herbicide, while other members of the same species are not resistant to the herbicide. Which combination of events should cause the most effective replacement of the non-herbicide-resistant strain of plants by the resistant strain?

1. The presence of the herbicide in the environment

2. The absence of the herbicide from the environment

3. The maintenance of the proper conditions for one generation

4. The maintenance of the proper conditions for many generations

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#Question id: 13146

#Unit 8. Inheritance Biology

Two gene A and B  gene distance is 30 m.u. if the frequency of the given gametes is,

i) AaBb=0.70 ii) Aabb=0.30

What will be the correct prediction?

a) Genes a and b are linked in cis

b) A and B gene are independently assort

c) Gene a and b showing incomplete linkage

d)  Genes a and b are linked in trans

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#Question id: 10990

#Unit 7. System Physiology – Animal

Sympathetic stimulation of the heart normally causes which of the following conditions?

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#Question id: 17285

#Unit 13. Methods in Biology

If the arithmetic mean of the data given below is 28, 

The median of the series is  

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#Question id: 12330

#Unit 10. Ecological Principles

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

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#Question id: 19231

#Unit 12. Applied Biology

Microprojectile bombardments can be used to introduce foreign DNA into plant 

1. Cell suspensions

2. Callus cultures

3. Meristematic tissues

Which of the following above statements are correct?