A molecule that can act as a genetic material must fulfill the traits given below, except
A) it should be able to generate its replica B) it should be able to express itself in the form... View Article
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During DNA replication, Okazaki fragments are used to elongate
A) the leading strand away from replication fork B) the lagging strand towards replication fork C) the leading strand towards... View Article
In Down’s syndrome of a male child, the sex complement is
A) XY B) XO C) XX D) XXY Answer:A) XY Explanation: Down’s syndrome occurs due to an extra autosome, i.e.... View Article
A colour blind girl is rare because she will be born only when
A) her father and maternal grand father were colour blind B) her mother and maternal grand father were colour blind... View Article
RR (Red) Antirrhinum is crossed with white (WW) one. Offspring RW are pink. This is an example of
A) incomplete dominance B) dominant-recessive C) supplementary genes D) hybrid Answer: A) incomplete dominance Explanation: Inheritance of flower colour in Antirrhinum... View Article
The allele which is unable to express its effect in the presence of another is called
A) supplementary B) codominant C) recessive D) complementary Answer: C) recessive Explanation: The recessive allele is not expressed in the phenotype... View Article
Mendel’s last law is
A) dominance B) segregation C) polygenic inheritance D) independent assortment Answer: D) independent assortment Explanation: According to Mendel’s law of independent... View Article
The contrasting pairs of factors in Mendelian crosses are called
A) allelomorphs B) multiple alleles C) paramorphs D) alloloci Answer: A) allelomorphs Explanation: The contrasting pairs of factors in Mendelian crosses... View Article
In human beings 45 chromosomes/ single X/XO abnormality causes
A) Kinefelter’s syndrome B) Down’s syndrome C) Edward’s syndrome D) Turner’s syndrome Answer:D) Turner’s syndrome Explanation: Human beings having Turner’s... View Article
A colour blind mother and normal father would have
A) colour blind sons and daughters B) colour blind sons and normal/carrier daughters C) all normal D) all colour blind... View Article
An organism with two identical alleles is
A) hybrid B) dominant C) homozygous D) heterozygous Answer: C) homozygous Explanation: Two identical alleles of a gene present on homologous... View Article
Of a normal couple, half the sons are haemophiliac while half the daughters are carriers. The gene is located on
A) Y chromosome of father B) X chromosome of father C) both the X chromosomes of mother D) one X... View Article
Of both normal parents, the chance of a male child becoming colour blind are
A) possible only when all the four grandparents had normal vision B) possible only when mother’s father was colour blind... View Article
The colour blindness is more likely to occur in males than in females because
A) genes for characters are located on the X chromosomes B) the trait is dominant in males and recessive in... View Article
Albinism is a congenital disorder resulting from the lack of which enzyme?
A) Xanthine oxidase B) Tyrosinase C) Fructokinase D) Catalase Answer:B) Tyrosinase Explanation: Albinism is caused due to the lack of... View Article
A child’s blood group is ‘O’. The parent’s blood groups cannot be
A) A and A B) A and B C) AB and O D) B and O Answer:C) AB and O... View Article
The most striking example of point mutation is found in a disease called
A) sickle cell anaemia B) Down’s syndrome C) night blindness D) thalassaemia Answer:A) sickle cell anaemia Explanation: Point mutation refers... View Article
Crossing over in diploid organism is responsible for
A) recombination of linked alleles B) segregation of alleles C) linkage between genes D) dominance of genes Answer:A) recombination of... View Article
When a single gene influences more than one trait it is called
A) pleiotropy B) pseudodominance C) epistasis D) none of these Answer:A) pleiotropy Explanation: When a single gene influences multiple phenotype... View Article
In human beings, multiple genes are involved in the inheritance of
A) skin colour B) sickle cell anaemia C) phenylketonuria D) colour blindness Answer:A) skin colour Explanation: Skin colour is an... View Article
