Q5 of 20 Page 230

What is the cause of variation?

The causes of genetic variations are:


(i) Change in genetic material


(ii) Mutation


(iii) Random mating


(iv) Random fertilization


(v) Recombination between homologous chromosomes during meiosis


(vi) And many environmental factors like light, temperature, nutrition, wind, water supply, etc.


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3

What is hereditary?

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What do you understand by monohybrid and dihybrid cross performed by Mendel?

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A change in DNA that is useful for one property to start with can become useful later for a different function. Explain.

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Name the scientific terms used to represent the following:

i. The branch of biology dealing with the study of heredity and variation


ii. The transmission of traits from parents to offspring.