Haemophilic man marries a normal woman.Their offsprings will be
A) all boys haemophilic B) all haemophilic C) all girls carrier D) all girls haemophilic Answer: C) all girls carrier Explanation:... View Article
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A gene pair hides the effect of another gene. The phenomenon is called
A) segregation B) dominance C) mutation D) epistasis Answer:D) epistasis Explanation: When a gene masks the phenotypic effect of another... View Article
According to Mendelism, which character shows dominance?
A) Green colour in seed coat B) Terminal position of flower C) Green pod colour D) Wrinkled seeds Answer: C) Green... View Article
Independent assortment of genes does not takes place when
A) genes are linked and located on same chromosome B) genes are located on homologous chromosomes C) genes are located... View Article
Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called
A) polygene B) epistasis C) complementary gene D) non complementary gene Answer: C) complementary gene Explanation: Complementary genes are present in... View Article
A diseased man marries a normal woman. They have three daughters and five sons. All the daughters were diseased and the sons were normal. The gene of this disease is
A) sex linked recessive B) sex linked dominant C) autosomal dominant D) sex limited character Answer:B) sex linked dominant Explanation:... View Article
A gene is said to be dominant if
A) it expresses its effect only in heterozygous condition B) it expresses its effect only in homozygous state C) it... View Article
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... 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... 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... 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... 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 assortment, segregation... 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... 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 during pregnancy.... 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)... 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... 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... 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 inheritance refers to the... 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... View Article
