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12th Tamil Nadu Board
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Accurate mapping of genes can be done by three point test cross because increases

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Important Questions on Chromosomal Basis of Inheritance

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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 6
Due to incomplete linkage in maize, the ratio of parental and recombinants are
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 7
Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 8
The point mutation sequence for transition, transition, transversion and transversion in DNA are
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 9
 If haploid number in a cell is 18. The double monosomic and trisomic number will be.
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 10
Changing the codon AGC to AGA represents
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 11
Assertion (A): Gamma rays are generally used to induce mutation in wheat varieties.
Reason (R): Because they carry lower energy to non-ionize electrons from atoms.
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 12
How many map units separate two alleles A and B if the recombination frequency is 0.09?
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12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 3 - Chromosomal Basis of Inheritance>Evaluation>Q 13
“When” two different genes came from the same parent they tend to remain together.
i) What is the name of this phenomenon?
ii) Draw the cross with a suitable example.
iii) Write the observed phenotypic ratio.