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12th Standard English Medium Biology (Zoology) Subject Principles of Inheritance and Variation Creative 2 Mark Questions with Solution Part - II 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 2

5 x 2 = 10

Write the symptoms of Patau's syndrome.

Comment on Trisomy-21.

Complete the equation.
(a) Phenylalanine \(\underrightarrow { A } \) Tyrosine
(b) DOPA \(\underrightarrow { B } \) Melanin

What is the phenotype of (a) I^Al^O (b) 1^O1^O

Observe the symbol used in pedigree analysis and give the proper terms they represent.

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Answers Key:

Generic 2

5 x 2 = 10

It is characterized by multiple and severe body malformations as well as profound mental deficiency. Small head with small eyes, cleft palate, malformation of the brain and internal organs are some of the symptoms of this syndrome.

Trisomic condition of chromosome - 21 results in Down's syndrome. It is characterized by severe mental retardation, defective development of the central nervous system, increased separation between the eyes, flattened nose, ears are malformed, mouth is constantly open and the tongue protrudes.

(a) A = Phenylalanine hydroxylase
(b) B = Tyrosinase

(a) I^Al^O - A blood group person
(b) 1^O1^O- O blood group person

- Male
- Carrier of sex-linked recessive
- Mating
- Affected male