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

Mendel crossed plants that breed true for yellow seeds with plants that breed true for green seeds. All seeds in F-generation were yellow. Work out the inheritance involved in this cross by using symbols for each traits and state which trait was dominant?

Differentiate between a template strand and coding strand of DNA.

Egrets are often seen along with grazing cattle. How do you refer to this interaction? Give a reason for this association.

Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also resistant to other pests as well?

Given below are the events that are observed in artificial hybridisation programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme.
(a) Re-bagging; (b) Selection of parents; (c) Bagging; (d) Dusting the pollen on stigma; (e) Emasculation; (f) Collection of pollen from male parent.

Identify a, b, c, d, e and f in the table given below:

S. No.	Organism	Bioactive molecule	Use
A.	Monascus purpureus (yeast)	a	b
B.	c	d	antibiotic
C.	e	Cyclosporin A	f

From which germ layers do the following organs differentiate?

1. Kidney.
2. Urinary bladder.

Fill in the trophic levels (1, 2, 3 and 4) in the boxes provided in the figure.

To maintain the continuity of its life, Plasmodium protozoa requires both mosquito and human hosts.” Explain.