What is necessary in order for organisms to change over generations?

What will be an ideal response?


genetic variation

Biology & Microbiology

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Which of the following is a disadvantage of using Bt to control insects? 

A. Bt does not accumulate in the soil or in nontarget animals. B. Though not well documented it is possible for horizontal gene flow to introduce Bt genes into other plants. C. The toxin can only be activated in target insects so it is nontoxic to mammals. D. Bt is easily degraded in the natural environment. 

Biology & Microbiology

Which component of the accompanying scenario would be considered the sensor?

a. release of insulin b. glycogen and fat synthesis c. potassium ion channel d. increased glucose levels e. liver and muscle

Biology & Microbiology

In flowering plants, gametes are produced by the process of mitosis

1.True 2.False

Biology & Microbiology

The ABO blood group locus in humans provides an example of epistasis

Indicate whether the statement is true or false

Biology & Microbiology