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Principles of Inheritance and Variation

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2002

A gene is said to be dominant if : -

  1. It is expressed only in heterozygous condition
  2. It expresses its effect only in homozygous stage
  3. It is never expressed in any condition
  4. It is expressed both in homozygous and heterozygous condition

Answer

(4) It is expressed both in homozygous and heterozygous condition

Solution

As per NCERT, a dominant factor (allele) expresses itself in the phenotype whether it is present with a similar allele (homozygous, TT) or with a dissimilar allele (heterozygous, Tt).

∵ In Tt, the dominant allele T masks the recessive allele t, and the phenotype is the same as that of TT.

∴ A dominant gene is expressed both in homozygous and heterozygous condition.

Answer: (4)

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Ques. 2AIPMT 2002

A diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is : -

  1. Sex linked dominant
  2. Autosomal dominant
  3. Sex linked recessive
  4. Sex limited character
Ques. 3AIPMT 2002

Which of the following is a correct match -

  1. Sickle cell anaemia = X – Chromosome
  2. Down Syndrome = 21st Chromosome
  3. Haemophilia = Y – Chromosome
  4. Parkinson Disease = X & Y Chromosome
Ques. 4AIPMT 2002

Change in sequence of nucleotide in DNA is called as -

  1. Recombination
  2. Mutation
  3. Mutagen
  4. Translation
Ques. 5AIPMT 2002

If a diploid cell is treated with colchicine then it becomes : -

  1. Tetraploid
  2. Monoploid
  3. Diploid
  4. Triploid
Ques. 6AIPMT 2001

Two non-allelic genes produce the new phenotype when present together but fail to do so independently then it is called

  1. Polygene
  2. Complementary gene
  3. Non-complementary gene
  4. Epistasis
Ques. 7AIPMT 2001

A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab?

  1. AABB and aabb
  2. None
  3. AaBb and aabb
  4. AAbb and aabb
Ques. 8AIPMT 2001

When dominant and recessive alleles express themselves together it is called

  1. Dominance
  2. Pseudo dominance
  3. Co-dominance
  4. Amphidominance
Ques. 9AIPMT 2001

Ratio of complementary genes is

  1. 9 : 3 : 4
  2. 9 : 7
  3. 12 : 3 : 1
  4. 9 : 3 : 3 : 4
Ques. 10AIPMT 2001

Independent assortment of genes does not take place when

  1. Genes are located on non-homologous chromosomes
  2. Genes are linked and located on same chromosome
  3. Genes are located on homologous chromosomes
  4. All the above
Ques. 11AIPMT 2001

Sickle cell anaemia is due to

  1. Change of amino acid in either or chain of haemoglobin
  2. Change of amino acid in chain of haemoglobin
  3. Change of amino acid in both and chain of haemoglobin
  4. Change of amino acid in chain of haemoglobin

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