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Principles of Inheritance and Variation · Question 150

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

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)

AIPMT 2002

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2

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
AIPMT 2002
3

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
AIPMT 2002
4

Change in sequence of nucleotide in DNA is called as -

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

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

  1. Tetraploid
  2. Monoploid
  3. Diploid
  4. Triploid
AIPMT 2002
6

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
AIPMT 2001
7

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
AIPMT 2001
8

When dominant and recessive alleles express themselves together it is called

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

Ratio of complementary genes is

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

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
AIPMT 2001
11

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
AIPMT 2001

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