Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Explain the evolutionary theory of living form based on the observations of Charles Darwin.

A teacher wants his/her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible.

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.

How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognitia?

Find out the role of microbes in the following and discuss it with your teacher.
(a) single cell protein (SCP)
(b) soil

Female reproductive organs and associated functions are given below in column A and B. Fill in the blank boxes.

Column A	Column B
Ovaries	Ovulation
Oviduct	A
B	Pregnancy
Vagina	Birth

1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
2. If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

(i) Which is that specific geographical area where these organism are found?
(ii) Name and explain the phenomenon that resulted in the development of so many dive species in this region.
(iii) Explain by writing the reasons how it was possible for the placental Wolf and Tasmanian wolf to live together in the same environment?

During a medical investigation, an infant was found to possess an extra chromosome 21. Describe the symptoms the child is likely to develop later in the life.

1. Name two groups of plants each, which have a:

1. Haploid body and
2. Diploid body.

2. What is meant by gamete transfer?