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Principles of Inheritance and Variation

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2001

Number of Barr bodies in XXXX female is

  1. 3
  2. 1
  3. 2
  4. 4

Answer

(1) 3

Solution

A Barr body is an inactivated, condensed X chromosome seen in the nucleus of a somatic cell.

In a cell only one X chromosome stays active; all the others are inactivated (Lyon hypothesis).

⇒ Number of Barr bodies = (number of X chromosomes) − 1

∴ For XXXX female: Barr bodies = 4 − 1 = 3

Answer: (1)

Keep practising — Principles of Inheritance and Variation

Ques. 2AIPMT 2001

Male XX and female XY sometime occur due to

  1. Aneuploidy
  2. Deletion
  3. Transfer of segments in X and Y chromosomes
  4. Hormonal imbalance
Ques. 3AIPMT 2001

Probability of four sons to a couple is : -

  1. 116
  2. 18
  3. 14
  4. 132
Ques. 4AIPMT 2000

Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered:

  1. 50%
  2. 100%
  3. 75%
  4. 25%
Ques. 5AIPMT 2000

According to mendelism which character is showing dominance?

  1. Green colour in seed coat
  2. Wrinkled seed
  3. Terminal position of flower
  4. Green pod colour
Ques. 6AIPMT 2000

Mongolian idiots are due to trisomy in 21st chromosome is called:

  1. Klinefelter's syndrome
  2. Down's syndrome
  3. Turner's syndrome
  4. Triplex syndrome
Ques. 7AIPMT 2000

Erythroblastosis foetalis is caused when:

  1. Rh- female & Rh+ male
  2. Rh- female & Rh- male
  3. Rh+ female & Rh+ male
  4. Rh+ female & Rh- male
Ques. 8AIPMT 2000

In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in male. It proves:

  1. Y chromosome is active in sex determination in both human beings and Drosophila
  2. In Drosophila Y-chromosome decides femaleness
  3. Y chromosome of man have genes for syndrome
  4. In human beings Y chromosome is active in sex determination

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