Reproductive Health — BIOLOGY STD 12 Science — Question

“Pollen grains has some harmful effects”. Discuss.

This image highlights the process of Gene Therapy of ADA-SCID.

i. Mention the cause of ADA deficiency in humans.
ii. How has genetic engineering helped patients suffering from it?

How is corpus luteum formed and what is its important function?

Write a short note on Double fertilisation.

Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life.

Biological Oxygen Demand or BOD increases with increase in water pollution. In this reference, answer the questions that follow:

1. At a particular segment of the river near a sugar factory, the BOD is much higher than the normal level. What is it indicative of?
2. What will happen to the dissolved oxygen and living organisms in this part of the river?

Explain the phenomena of dominance, multiple allelism and co–dominance taking ABO blood group as an example.

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.

1. Represent this cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.
2. Write the conclusion you draw of the inheritance pattern of this disease.

It is a common practice to plant trees and shrubs near the boundary walls of buildings. What purpose do they serve?

1. One of the codons on mRNA IS AUG. Draw the structure of RNA adapter molecule for this codon.
2. Name the RNA polymerase that transcribes RNA in eukaryotes.
3. What is unique about the amino acid this RNA binds with?