Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

On a visit to a Hill station, one of your friends suddenly became unwell and felt uneasy.

1. List two symptoms, you would look for, to term it to be due to allergy.
2. Explain the response of the body to an allergen.
3. Name two drugs that can be recommended for immediate relief.

Draw the next mature stage and label the parts.

Which one of the two in-situ or ex-situ biodiversity conservation measures help the larger number of species to survive? Explain.

One of the twins born to parents having normal colour vision was colour blind whereas the other twin had normal vision. Work out the cross. Give two reasons how it is possible.

Identify A, B, C and D in the table given below:

Micro-organism	Product	Biological activity	Medical ailment/ Procedure
A	Streptokinase	Clot buster	D
Trichoderma	B	C	Transplant
Polysporum			Surgery

Community service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

1. Why is there a need to organise such visits?
2. Write the steps you will highlight as a member of this department, in your interactions with them to enable them to lead a healthy life.

How would you find genotype of a tall pea plant bearing white flowers? Explain with the help of a cross. Name the type of cross you would use.

i. Why is the collection of white-winged moths and dark-winged moths made in England between 1850-1920 considered a good example of natural selection?
ii. Evolution is based on chance events in nature and chance mutations in organisms. Justify the statement.

What will happen to an ecosystem if:
All producers are removed.

What is GMO? List any five possible advantages of a GMO to a farmer.