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Which one of the following conditions though harmful in itself, is also potential saviour from a mosquito borne infectious disease?

A) Sickle cell anaemia B) Thalassaemia C) Leukaemia D) Pernicious anaemia Answer:A) Sickle cell anaemia Explanation: Sickle cell anaemia is an... View Article

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as

A) reciprocal cross B) test cross C) reverse cross D) dihybrid cross Answer: A) reciprocal cross Explanation: Reciprocal cross is done to... View Article

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?

A) Five B) Six C) Four D) Seven Answer: C) Four Explanation: The seven contrasting pairs of characters studied by Mendel are present on four... View Article

Which one of the following traits of garden pea studied by Mendel was a recessive feature?

A) Green seed colour B) Axial flower position C) Round seed shape D) Green pod colour Answer: A) Green seed colour Explanation: Mendel based... View Article

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to

A) recombination B) repulsion C) crossing over D) linkage Answer: D) linkage Explanation: According to Mendel’s law of independent... View Article

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy

A) must be colour blind B) may be colour blind or may be of normal vision C) will be partially colour blind since he is heterozygous for the... View Article

Which of the following is not a hereditary disease?

A) Thalassaemia B) Cystic fibrosis C) Cretinism D) Haemophilia Answer: C) Cretinism Explanation: Cretinism is caused due to hypothyroidism... View Article

Haemophilia is more commonly seen in human males than in human females because

A) this disease is due to a Y-linked recessive mutation B) a greater proportion of girls die in infancy C) this disease is due to an... View Article

How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

A) four B) three C) nine D) two Answer: D) two Explanation: A plant having genotype AABbCC will produce only two types of gametes, ABC and... View Article

Sickle cell anaemia has not been eliminated from the African population because

A) it is controlled by recessive genes B) it is controlled by dominant genes C) it provides immunity against malaria D) it is not a fatal... View Article

If a colour blind woman marries a normal visioned man, their sons will be

A) all normal visioned B) all colour blind C) three-fourths colour blind and one-fourth normal D) one-half colourblind and one-half... View Article

Inheritance of skin colour in humans is an example of

A) polygenic inheritance B) point mutation C) chromosomal aberration D) codominance Answer: A) polygenic inheritance Explanation: Polygenic... View Article

A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

A) AABb B) AaBB C) AaBb D) AABB Answer:C) AaBb Explanation: As the person produces sperm having both the alleles for both the characters. So... View Article

Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

A) Down’s syndrome - 44 autosomes + XO B) Erythroblastosis foetalis - X-linked C) Colour blindness - Y-linked D)... View Article

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having

A) one antibody only either anti-A or anti-B on the RBCs B) overdominance of this type on the genes for A and B types C) other... View Article

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