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Principles of Inheritance and Variation · Question 151

AIPMT 2002MCQEasy📈 Topic in 50% papers+4−1
1

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

Answer

(1) Sex linked dominant

Solution

A father passes his X-chromosome to every daughter and his Y-chromosome to every son.

∵ All daughters are diseased ⇒ the disease gene is on the father's X-chromosome.

∵ The mother is normal and still every daughter shows the disease ⇒ a single copy of the gene is enough, i.e., it is dominant.

∵ Sons get the Y-chromosome from the father and a normal X from the mother ⇒ all sons are normal.

∴ The gene is sex linked (X-linked) dominant.

Answer: (1)

AIPMT 2002

Keep practising — Principles of Inheritance and Variation

2

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
3

Change in sequence of nucleotide in DNA is called as -

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

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

  1. Tetraploid
  2. Monoploid
  3. Diploid
  4. Triploid
AIPMT 2002
5

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
6

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
7

When dominant and recessive alleles express themselves together it is called

  1. Dominance
  2. Pseudo dominance
  3. Co-dominance
  4. Amphidominance
AIPMT 2001
8

Ratio of complementary genes is

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

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
10

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
11

Number of Barr bodies in XXXX female is

  1. 3
  2. 1
  3. 2
  4. 4
AIPMT 2001

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