Genetics One Mark Online Test

Genetics One Mark Online Test (10th Standard Science)

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According to Mendel alleles have the following character

A.Pair of genes B.Responsible for character C.Production of gametes D.Recessive factors

9 : 3 : 3 : 1 ratio is due to

A.Segregation B.Crossing over C.Independent assortment D.Recessiveness

The region of the chromosome where the spindle fibres get attached during cell division

A.Chromomere B.Centrosome C.Centromere D.Chromonema

The centromere is found at the centre of the ________________ chromosome.

A.Telocentric B.Metacentric C.Sub-metacentric D.Acrocentric

The _____________ units form the backbone of the DNA.

A.5 carbon sugar B.Phosphate C.Nitrogenous bases D.Sugar phosphate

Okasaki fragments are joined together by ___________________ .

A.Helicase B.DNA polymerase C.RNA primer D.DNA ligase

The number of chromosomes found in human beings are ___________________ .

A.22 pairs of autosomes and 1 pair of allosomes. B.22 autosomes and 1 allosome C.46 autosomes D.46 pairs autosomes and 1 pair of allosomes.

The loss of one or more chromosome in a ploidy is called ___________ .

A.Tetraploidy B.Aneuploidy C.Euploidy D.polyploidy

The scientist regarded as the father of genetics is

A.Charles Darwin B.Gregor Johann Mendel C.Hugo de Vries D.Thomas Hunt Morgan

Q10

How many pairs of contrasting traits did Mendel choose for his experiments?

A.Five B.Six C.Seven D.Eight

Q11

The process of acquiring characters or traits from parents is called

A.Variation B.Heredity C.Mutation D.Evolution

Q12

The monohybrid phenotypic ratio obtained in the F2 generation is

A.3 : 1 B.1 : 2 : 1 C.9 : 3 : 3 : 1 D.1 : 1

Q13

Chromosomes bearing an elongated knob-like appendage are said to carry a

A.Centromere B.Telomere C.Satellite D.Chromomere

Q14

The terminal end of a chromosome is called the

A.Centromere B.Telomere C.Satellite D.Secondary constriction

Q15

A chromosome with the centromere at one end, so that it appears rod shaped, is

A.Metacentric B.Sub-metacentric C.Acrocentric D.Telocentric

Q16

Each nucleotide of DNA consists of a phosphate group, a nitrogenous base and

A.a deoxyribose sugar B.a ribose sugar C.an amino acid D.a fatty acid

Q17

In the DNA molecule base pairing always occurs between

A.two purines B.two pyrimidines C.a purine and a pyrimidine D.a sugar and a phosphate

Q18

The double helix model of DNA was proposed by

A.Mendel and Morgan B.Watson and Crick C.Darwin and Wallace D.Hugo de Vries and Correns

Q19

The enzyme that unwinds the two strands of DNA during replication is

A.Helicase B.DNA ligase C.RNA primase D.DNA polymerase

Q20

New nucleotides are added to form the complementary strand of DNA with the help of

A.DNA ligase B.Helicase C.DNA polymerase D.Amylase

Q21

The sex of a child is determined by

A.the ovum produced by the mother B.the sperm produced by the father C.both parents equally D.the number of autosomes

Q22

An inheritable change in the genetic material of an organism is called

A.Heredity B.Variation C.Mutation D.Karyotype

Q23

The number and appearance of the complete set of chromosomes of a cell is known as its

A.Genotype B.Phenotype C.Karyotype D.Allele

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About this Genetics test

This free online practice test covers Genetics from the 10th Standard Science (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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