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Principles of Inheritance and Variation · Question 134

AIPMT 2004MCQMedium📈 Topic in 38% papers+4−1
1

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in -

  1. 50% of the progenies
  2. 1/3 of the progenies
  3. None of the progenies
  4. All the progenies

Answer

(3) None of the progenies

Solution

Mitochondria (with their own DNA) are present in the cytoplasm of the cell.

⇒ The zygote receives almost all of its cytoplasm, and hence its mitochondria, from the egg (female parent); the sperm contributes practically only its nucleus.

∴ Mitochondrial genes show maternal (cytoplasmic) inheritance and do not segregate in Mendelian ratios.

∵ The parent carrying the mitochondrial mutation is used as the male, the mutation is not passed to the F1, and therefore it does not appear in any F2 progeny.

Answer: (3)

AIPMT 2004

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2

A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-

  1. All colour-blind
  2. 75% colour-blind
  3. All normal
  4. 50% colour-blind
AIPMT 2004
3

The recessive genes located on X-chromosomes in humans are always -

  1. Expressed in females
  2. Sub-lethal
  3. Expressed in males
  4. Lethal
AIPMT 2004
4

After a mutation at a genetic locus the character of an organism changes due to the change in :-

  1. Protein synthesis pattern
  2. RNA transcription pattern
  3. DNA replication
  4. Protein structure
AIPMT 2004
5

In a mutational event, when adenine is replaced by guanine, it is a case of -

  1. Frameshift mutation
  2. Transition
  3. Transversion
  4. Transcription
AIPMT 2004
6

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

  1. Green seed colour
  2. Green pod colour
  3. Axial flower position
  4. Round seed shape
AIPMT 2003
7

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

  1. Six
  2. Seven
  3. Five
  4. Four
AIPMT 2003
8

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:

  1. Reciprocal cross
  2. Reverse cross
  3. Test cross
  4. Dihybrid cross
AIPMT 2003
9

Pattern baldness, moustaches and beard in human males are examples of:

  1. Sex limited traits
  2. Sex influenced traits
  3. Sex determining traits
  4. Sex linked traits
AIPMT 2003
10

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

  1. Pernicious anaemia
  2. Thalassaemia
  3. Leukemia
  4. Sickle cell anaemia
AIPMT 2003
11

Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?

  1. 50%
  2. 100%
  3. 75%
  4. 25%
AIPMT 2003

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