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12th Standard English Medium Biology (Zoology) Subject Principles of Inheritance and Variation Creative 3 Mark Questions with Solution Part - I updated Creative Questions

Published on: 13/05/2022

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Std: 12th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

The following table shows the genotypes for ABO blood grouping and this phenotypes. Complete the table by filling the gaps.

S.No	Genotype	Phenotype
1	I^AI^A	A
2	?	A
3	?	AB
4	I^OI^O	?

What is euphenics?

What is the role of the gene responsible for colour blindness in a normal human beings?

Draw a schematic representation to show ZW - ZZ type of sex determination.

What is null allele?

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Answers Key:

Generic 3

5 x 3 = 15

2) l^AI^O
3) I^AI^B
4) O

(i) The symptomatic treatment of genetic disease of man is called Euphenics or Medical engineering.
(ii) In 1960, Joshua Lederberg coined the term euphenics. It means normal appearing.
(iii) It deals with the control of several inherited human diseases especially the inborn errors of metabolism.
Eg. Phenylketonuria (PKU)

(i) A dominant X - linked gene is necessary for the formation of colour sensitive cells, the cones. which helps to distinguish colours.
(ii) A recessive form of the gene is incapable of producing the cones. Hence the affected person is unable to distinguish red and green colour.

In ABO blood group, each allele (I^A and I^B) produces a transferase enzyme. I^A allele produces N-acetyl galactose transferase and can add N-acetyl galactosamine (NAG) and Ballele encodes for the enzyme galactose transferase that adds galactose to the precursor (i.e. H substances) In the case of I^o/I^o allele no terminal transferase enzyme is produced and therefore called "null" allele arid hence cannot add NAG or galactose to the precursor.