Evolution — BIOLOGY STD 12 Science — Question

If two genes are located far apart from each other on a chromosome, how the frequency of recombination will get affected?

Write two examples of carcinogens.

Which one of the following diseases could be avoided in the progeny by analyzing the pedigree of the parents: Down's syndrome, Phenylketonuria, Poliomyelitis.

Mention the information that the health workers derive by measuring BOD of a water body.

What is the method of directly injecting a sperm into ovum called as?

What makes the Nucleopolyhedrovirus a desirable biological control agent?

OR

 What is the significance of Nucleopolyhedrovirus in pest management?

The pedigree chart given below shows a particular trait which is absent in parents, but present in the next generation irrespective of sexes. Draw your conclusion on the basis of the pedigree.

Directions: In the following questions, the Assertions (A) and Reason(s) (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: PCR can detect very low amounts of DNA and is now routinely used to defect HIV in suspected AIDS patient.
Reason: PCR is a powerful technique to identify many other genetic disorders.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Name the process in which the unwanted mRNA regions are removed and the wanted regions are joined.

Expand the terms rDNA and cDNA.