Principles of Inheritance and Variation MCQ Questions & Answers in Botany

391. Minor changes at gene level are described as

A Point mutations

B Chromosomal mutations

C Reverse mutations

D Forward mutations

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392. Sickle cell anaemia induces due to

A Change of Amino Acid in a - chain of Haemoglobin

B Change of Amino Acid in P - chain of Haemoglobin

C Change of Amino Acid in both a and P chain of Haemoglobin

D Change of Amino acid either a or P chain of Haemoglobin

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393. A man and a woman,who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease

A Sex-limited recessive

B Autosomal dominant

C Sex-linked recessive

D Sex-linked dominant

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394. Which evidence of evolution is related to Darwin's frinches

A Evidences from biogographical distribution

B Evidences from comparative anatomy

C Evidences from embryology

D Evidences from palaeotological

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395. Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?

A 25%

B 100%

C 75%

D 50%

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396. Organisms with two or more than two types of genotypes in their tissues are called

A Wobble

B Heterozygous

C Heterosis

D Chimera

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397. The total number of nitrogenous bases in human genome is estimated to be about

A 3.5 million

B 35 thousand

C 35 million

D 3.1 billion

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398. Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

A The discrete unit controlling a particular character is called a factor

B Out of one pair of factors one is dominant, and the other recessive Principles of Inheritance and Variation 321

C Alleles do not show any blending and both the characters recover as such in $${F_2}$$ generation

D Factors occur in pairs

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399. A sinistral shelled female snail having Dd genotype , cross with dextral shelled male having dd genotype. What type of shell will be present in the progeny

A All dextral

B All sinistral

C 0% dextral, 50% sinistral

D None of the above

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400. Genotype is

A Genetic composition of many organisms

B Genetic composition of plastids

C Genetic composition of germ cells

D Genetic composition of an individual

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391. Minor changes at gene level are described as

392. Sickle cell anaemia induces due to

393. A man and a woman,who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease

394. Which evidence of evolution is related to Darwin's frinches

395. Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?

396. Organisms with two or more than two types of genotypes in their tissues are called

397. The total number of nitrogenous bases in human genome is estimated to be about

398. Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

399. A sinistral shelled female snail having Dd genotype , cross with dextral shelled male having dd genotype. What type of shell will be present in the progeny

400. Genotype is

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