Question 21
Select the statements that describe characteristics of genes.

(i) Genes are the specific sequence of bases in a DNA molecule.
(ii) A gene does not code for proteins.
(iii) In individuals of a given species, a specific gene is located on a particular chromosome.
(iv) Each chromosome has only one gene.

(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)

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Solution

(b) (i) and (iii)

A gene is the basic physical and functional unit of heredity. Genes which are made up of DNA, have in them coded instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases. Genes are the specific sequence of bases in a DNA molecule and in individuals of a given species, a specific gene always located on a particular chromosome.

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Question 21
Select the statements that describe characteristics of genes.

(i) Genes are the specific sequence of bases in a DNA molecule.
(ii) A gene does not code for proteins.
(iii) In individuals of a given species, a specific gene is located on a particular chromosome.
(iv) Each chromosome has only one gene.

(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)

Q. Select the statements that are true for genes.

i. Genes are specific sequences of nucleotides in a DNA molecule.
ii. A gene does not store information for protein synthesis.
iii. In individuals of a given species, a specific gene is located on a particular chromosome.
iv. Each chromosome has only one gene.
v. Genome identification is the basis of DNA fingerprinting.

Select the statement that describes the characteristics of genes.

(1) Proteins are never coded by DNA.

(2) Self-replicating materials are present in all living organisms as the main constituent of their genetic material.

(3) In an individual of a particular species, a specific gene is located on a particular chromosome.

(4) One chromosome can code one protein.

Q. Arrange these discoveries in chronological order from oldest to latest.
i. Isolation of a compound called nuclein.
ii. “Heredity factors”
iii. Genes are located on chromosomes
iv. DNA is genetic material

Match the following:

$\begin{matrix} A . D N A p r o f i l i n g & i) T r e a t e m e n t o f g e n e t i c d i s e a s e s B . G e n e m a p p i n g & i i) T e s t i n g t h e a r r a n g e m e n t o f n u c l e o t i d e s C . G e n e t h e r a p y & i i i) T h e s u m o f g e n e t i c m a t e r i a l p r e s e n t i n a n o r g a n i s m D . G e n o m e & i v) L o c a t i n g t h e p o s i t i o n o f a g e n e i n t h e D N A \end{matrix}$

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Genes

Standard VI Biology

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