Tamil Nadu State Board ( Samacheer Kalvi ) Online Test based on Book Back Questions - 9th Standard Science - English Medium - Heredity

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Samacheer Kalvi 9th Science - Heredity - Book Back Questions in English Medium

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Question 1 Of 10

Okasaki fragments are joined together ______.

Helicase DNA polymerase RNA primer DNA ligase

Question 2 Of 10

The number of chromosomes found in human beings is_______.

22 pairs of autosomes and 1 pair of allosomes. 22 autosomes and 1 allosome 46 autosomes 46 pairs of autosomes and 1 pair of allosomes

Question 3 Of 10

The loss of one or more chromosomes in ploidy is called ________.

Tetraploidy Aneuploidy Euploidy Polyploidy

Question 4 Of 10

According to Mendel alleles have the following character

Pair of genes Responsible for character Production of gametes Recessive factors

Question 5 Of 10

The units form the backbone of the DNA.

5 carbon sugar Phosphate Nitrogenous bases Sugar phosphate

Question 6 Of 10

The centromere is found at the center of the chromosome.

Telocentric Metacentric Sub-metacentric Acrocentric

Question 7 Of 10

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

Chromomere Centrosome Centromere Chromonema

Question 8 Of 10

9 : 3 : 3 : 1 ratio is due to

Segregation Crossing over Independent assortment Recessiveness