Short Answer TypeA colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.
Mendel published his work on inheritance of characters in 1865, but it remained unrecognized till 1900. Give three reasons for the delay in accepting his work.
The following are the three reasons that led to the delay in accepting Mendel's work:
i) Lack of communication and publicity.
ii) His concept of factors (genes) as discrete units that did not blend with each other was not accepted in the light of variations occurring continuously in nature.
iii) Mendel's approach to explain biological phenomenon with the help of mathematics was also not accepted
Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?
Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
Identify ‘a’, ‘b’ and ‘c’ in the following table:
|
No. |
Crop |
Variety |
Insect Pests |
|
1. |
Brassica |
Pusa Gaurav |
(a) |
|
2. |
Flat bean |
Pusa Sem 2 |
(b) |
|
3. |
(c) |
Pusa Sawani |
Shoot and fruit borer |
Why are beehives kept in a crop field during flowering period? Name any two crop fields where this is practiced.
How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?
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