Chromosome 1: (i)genes ::_(ii)_ : 231 genes

(i)-2345; (ii)-X chromosome

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(i)-2968; (ii)-Y chromosome

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(i)-2345; (ii)-Y chromosome

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(i)-2968; (ii)-X chromosome

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Solution

The correct option is B (i)-2968; (ii)-Y chromosome
The Human Genome Project, which was an ambitious project to sequence the human genome, helped us to understand the chromosomes and their uniqueness in various aspects.

Chromosome 1 has 2968 genes. It is the chromosome with the highest number of genes.

The Y chromosome has 231 genes. It is the chromosome with the least number of genes.

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Q. Unit of distance between genes in a chromosome is known as

Q. Select the statements that describe characteristics of genes :
(i) genes are 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)

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. Match column I with column II with respect to the findings of the Human genome project and choose the correct option.

\begin{matrix} Column I & Column II 1. Maximum genes on a chromosome & A. Y chromosome 2. Largest gene & B. 3164.7 million bp 3. Total base pairs & C. 2.4 million base pairs 4. Least genes on a chromosome & D. 2968 \end{matrix}

A	B
a) Phenotype	i) Position of a gene on chromosome.
b) Genotype	ii) Genetic makeup of an organism.
c) Locus	iii) Physical expression of gene.
	iv) Position of chromosome on gene.

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Chromosome 1: __(i)__genes ::___(ii)___ : 231 genes

Chromosome 1: (i)genes ::_(ii)_ : 231 genes