Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

A person in your colony has recently been diagnosed with AIDS. People/residents in the colony want him to leave the colony for the fear of spread of AIDS.

1. Write your view on the situation, giving reasons.
2. List the possible preventive measures that you would suggest to the residents of your locality in a meeting organised by you so that they understand the situation.
3. Write the symptoms and the causative agent of AIDS.

List the attributes that populations but not individuals possess.

Draw a diagrammatic sketch of the sectional view of a typical anatropous ovule.

OR

Draw a labelled diagram of the sectional view of a typical anatropous ovule.

Describe the different methods for treatment of cancer.

Explain spermatogenesis.

Answer the following questions:
State and explain the law of dominance as proposed by Mendel.

Using Punnett square demonstrate the law of independent assortment in a dihybrid cross involving two heterozygous parents.

Draw a diagram of replication of AIDS virus, Name the pathogen of AIDS and describe the infection and symptoms of AIDS.

What is an artificial ecosystem? Describe an agro-ecosystem.

What is malaria ? Write down reason, symptoms, prevention and treatment.###Write about the malaria fever, its causes, symp-toms, control and prevention.###Name the different species of plasmodium which species is responsible for malignant malaria?