Control and Co-ordination — BIOLOGY STD 12 Science — Question

Types of traits: [Sickle-cell anaemia, Flower colour of Mirabelis jalapa, Coat colour of cattle, Human blood groups, Widow’s peak, Height in human beings.]

Column A	Column B
(1) Co-dominance	—————–
(2) Incomplete dominance	—————–
(3) Multiple allelism	—————-
(4) Pleiotropy	—————–
(5) Polygenes	—————-
(6) Autosomal dominance	——————

Describe different types of leucocytes.
OR
Describe five types of leucocytes, with the help of diagrams. Add a note on their functions.

A child suffering from thalassemia is born to a normal couple. But the mother is being blamed by the family for delivering a sick baby.

1. What is Thalassemia?
2. How would you counsel the family not to blame the mother for delivering a child suffering from this disease? Explain.
3. List the values your counselling can propagate in the families.

Define a cistron. Giving examples differentiate between monocistronic and polyeistronic transcription unit.

Populations Interactions

A village health worker was taking a session with women. She tells the women that one has to be very careful while using oral pills as method of birth control. Wrong usage can actually promote conception.
Analyse the statement and compare the merits and demerits of using oral pills and surgical methods of birth control.

Explain the principle of insertional inactivation by giving a suitable example.

Why has the heart-recipient to rely upon life-time supply of immunosuppressants?

Name the infective stage of Plasmodium. Give Symptoms of malaria

Your school has been selected by the Department of Education to organise and host an interschool seminar on "Reproductive Health - Problems and Practices". However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is "too embarrassing."
Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.