Question # 1

Example of discontinuous variation is:

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Blood group

Height in Man

Intelligence

None of these

Which is favourable variation in moths after industrial revolution?

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Light colour

Medium colour

Dark colour

None of these

The actual location of gene on chromosome is.

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Locus

Karyotype

chromatids

Centromere

The allele which is nto expressed in F₁ generation is called:

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Dominant

Recessive

Mutant

Selected

In the cross-pollination between a true-breeding yellow pod plant and a true-breeding green pod plant, where green pod colour is dominant, the resulting offspring will be.

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1/4 green , 3/4 yellow

All yelow

1/4 yellow, 3/4 green

All green

Chromatin material is made of:

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DNA

Protein

RNA

DNA and Protein

The position of gene on chromosome is known as:

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Locus

Allele

Genotype

Genome

Chromatin material is made of.

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DNA

Protein

RNA

DNA and protein

How many contrasting pairs of characters of pea plant were studied bu mendel?

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one

three

five

seven

In variation, the phenotypes shows a complete range of measurements from one extreme to the other is.

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Discontinuous

Continuous

^{Both a and b}

None of these

How many pairs of homologous chromosomes are present in human body cells.

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22

23

24

25

Among following, which is source of variations?

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Mutation

Crossing over

Gene flow

All of these

Which of the following statement regarding genes is FALSE.

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Genes are located on chromosomes

Genes consist of a long sequence of DNA

A gen contains information for the production of a protein

Each cell contain a single copy of every gene.

It is a homozygous genotype:

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AA

aa

Aa

both A and B

The are how many hydrogen bonds between cytosine and guanine?

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one

two

three

four

Among following which is example of co-dominance?

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Blood group A

Blood group B

Blood group AB

Blood group O

Outside back bone of double helix is made up:

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Sugar

Phosphate

Sugar Phosphate

None of these

How many pea plants were used in experiment of Mendel?

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28,000

29,000

26,000

27,000

Variatations show distinct phenotypes and phenotypes of such variations cannot be measured by:

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Discontinuous variations

Continuous variations

Both a and b

None of these

A DNA molecule consists of______ polynucleotide strands.

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2

3

4

5

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