Q4 of 42 Page 1

State the functions of mast cells in allergy response.

OR


State the function of interferons.


Allergy is because of the release of chemicals like histamine and serotonin from the mast cells.


OR


Virus-infected cells release proteins called interferons which protect non-infected cells from further viral infection.


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2

Name the pattern of inheritance where F1 phenotype:

(a) resembles only one of the two parents.


(b) does not resemble either of the two parents and is in between the two.


 3

According to the Hardy-Weinberg principle, the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population?

OR


Coelacanth was caught in South Africa. State the significance of discovery of Coelacanth in the evolutionary history of vertebrates.


 5

What is the cell that receives a recombinant gene called?

 6

Name a disorder a human suffers from as a result of monosomy of the sex chromosome. Give the karyotype and write the symptoms.