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.
Colour blindness is a sex-linked disease. The gene for this disorder is present on the X chromosome. If a colour-blind child is born to a normal couple, then the mother would be a carrier of the disease. The child would be male. The following cross shows the inheritance of the disorder:
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.
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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