NTSE Biology Heredity and Variations MCQs

Question: Mendel conducted his hybridization experiment with

• a) Chick pea
• b) Pigeon pea
• c) Garden pea
• d) Wild pea

Answer: Garden pea

Question: Gene controls -

• a) Protein synthesis but not heredity
• b) Protein synthesis and heredity
• c) Biochemical reaction of some enzymes
• d) Heredity but not protein synthesis

Answer: Protein synthesis and heredity

Question: Heredity means

• a) Transmission of traits from one generation of successive generations of living beings
• b) Dissimilarity between same species
• c) Both A & B are correct
• d) None of the above

Answer: Transmission of traits from one generation of successive generations of living beings

Question: If the basic sequence of the strains of DNA is CAT TAG CAT CAT GAC. What will be base sequence of complementary RNA strand ?

• a) GTA ATG ATG GUA CUG
• b) TAG ATG GTA GAT GAT CTS
• c) GUA AUC GUA GUA CUG
• d) GTA ACC GAT GAT CAT CAT

Answer: GUA AUC GUA GUA CUG

Question: In DNA replication, the okazaki fragment on the lagging strand are joined together by

• a) DNA polymerase
• b) Primase
• c) Helicase
• d) DNA ligase

Answer: DNA ligase

Question: During transcription, if the nucleotide sequence of the DNA strnd that is being coded is ATA CG, the nucleotide sequence in m, RNA would be

• a) TATGC
• b) TCTGG
• c) UAUGC
• d) UATGC

Answer: UAUGC

Question: If a particular animal has a shelled egg, hair & teeth in a body & has cloaca, it may be connecting link between

• a) Reptiles and Birds
• b) Birds & Mammals
• c) Reptiles & Mammas
• d) None of them are correct

Answer: Reptiles & Mammas

Question: If a cross is made between AA & aa the nature of F1 progeny will be

• a) Genotypically aa, phenotpically A
• b) Genotypically AA, phenotypically a
• c) Genotypically Aa, phenotypically A
• d) Genotypically Aa, phenotypically a

Answer: Genotypically Aa, phenotypically A

Question: Find the correct combination that can form a nucleotide of RNA

• a) Adenine + deoxyribose + phosphate
• b) Uracil + ribose + phosphate
• c) Thymine + ribose + phosphate
• d) Guanine + deoxyribose + phosphate

Answer: Uracil + ribose + phosphate

Question: Nucleotide are building blocks of nucleic acid, one nucleotide is composite molecule formed by

• a) Base - Sugar - Phosphate
• b) Base - Sugar - OH
• c) (Base - Sugar - Phosphate) - n
• d) Sugar phosphate

Answer: Base - Sugar - Phosphate

More Questions....................

Question: The correct statement is

• a) Plasmids are extracelluar genetic material which cannot replicate freely.
• b) Plasmide can replicate onlyby getting intergrated with main genetic material.
• c) If plasmids are removed from bacterial cell, the will die due to cessation of all the metabolic activites.
• d) Plasmids do not affect necessary biological activities of bacterial cell.

Answer: Plasmids do not affect necessary biological activities of bacterial cell.

Question: Ratio 9 : 3 : 3 : 1 is due to

• a) Duplicate gene
• b) Dihybrid cross
• c) Monohybrid cross
• d) Lethal genes

Answer: Dihybrid cross

Question: The body features are

• a) Phenotype
• b) Genotype
• c) Sex of individual
• d) Controlled by environment

Answer: Phenotype

Question: A genetically manipulated organism containing in it’s genome one or more inserted gene of another species is called

• a) Transposon
• b) Gene expression
• c) Transgenic organism
• d) Retroposons

Answer: Transgenic organism

Question: When a red flower homozygous pea plant is crossed with a white flower plant what colour is produced in F₁ generation.

• a) Red
• b) White
• c) Pink
• d) Red + white

Answer: Red

Question: When a red flower homozygous pea plant is crossed with a white flower plant what colour is produced in F1 generation.

• a) Red
• b) White
• c) Pink
• d) Red + white

Answer: Red

Question: A cross between AaBB X aa BB yeld a genotypic ratio of

• a) 1 AaBB : 1 aaBB
• b) 1 AaBB : aaBB
• c) 3Aa BB : 1 aa BB
• d) All AaBb

Answer: 1 AaBB : 1 aaBB

Question: Two allelic genes are located on

• a) The same chromosome
• b) Two homologous chromosomes
• c) Two non - homologous chromosomes
• d) Any two chromosomes

Answer: Two homologous chromosomes

Question: A white flowered mirabilis plant rr was crossed with red coloured RR, if 120 plants are produced in F2 generation. The result would be

• a) 90 uniformly colored and 30 white
• b) 90 Non - uniformly colored and 30 white
• c) 60 Non - uniformly colored and 60 white
• d) All colored and No white

Answer: 90 Non - uniformly colored and 30 white

Question: Allel is the

• a) Alternate trait of gene pair
• b) Total number of genes for a trat
• c) Total number of chromosome of a haploid set
• d) Total number of genes present on a chromosome rens

Answer: Alternate trait of gene pair

Question: Mendel’s law were rediscovered by

• a) Lamarck, Hugo de Vries and Carl Correns
• b) Hugo de Vries, Carl Correns and E.V. Tshermak
• c) Morgan, Geadle and Tatum
• d) Hugo de Vries, Morgan and Carl Cor

Answer: Hugo de Vries, Carl Correns and E.V. Tshermak

Question: A gene is said to be dominant if

• a) It expresses it’s effect only in homozygous stage
• b) It expresses it’s effect only in heterzygous stage
• c) It is expressed both in homozygous and heterozygous condition
• d) It is never expressed in any condition

Answer: It is expressed both in homozygous and heterozygous condition

Question: A cross produced identical phenotypic and genotype ratio. It is not an expected mendelian result, and can be attributed to

• a) Independent assortment
• b) Linkage
• c) Incomplete dominance
• d) None of the above

Answer: Incomplete dominance

Question: A genetic clone is

• a) Plant produced by asexual means
• b) Hybrid produced by sexual means
• c) Homozygous plant produced by sexual means
• d) Heterozygous plant produced by sexual means

Answer: Plant produced by asexual means

Question: In genetics the term ‘test cross’ means

• a) The crossing of F1 individuals with homozygous recessive
• b) Crossing an F1 individual with either of the 2 parents    
• c) Crossing an F1 individual with another F1 individual
• d) Crossing F1 individual with that of F2

Answer: The crossing of F1 individuals with homozygous recessive

Question:  F1 plants crossed with dominant individuals will yield a progeny of -

• a) All recessive
• b) All dominants
• c) Dominant and recessive in the ratio of 1 : 1
• d) Dominant and recessive in the ratio of 3 : 1

Answer: All dominants

Question: Mendel did not include in his discoveries

• a) Dominance
• b) Purity of gametes / segregation
• c) Linkage
• d) Independent assortment

Answer: Linkage

Question: Monohybrid cross produced both tall & dwarf pea plants in the ratio of 3 : 1. Their genotype would be

• a) TT × Tt
• b) Tt × Tt
• c) Tt × tt
• d) tt × tt

Answer: Tt × Tt

Question: Mendel conducted his hybridization experiment with

• a) Chick pea
• b) Pigeon pea
• c) Garden pea
• d) Wild pea

Answer: Garden pea

Question: The body features are

• a) Phenotype
• b) Genotype
• c) Sex of individual
• d) Controlled by environment

Answer: Phenotype