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Principles of Inheritance and Variation · Question 161

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

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)

AIPMT 2001

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2

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
AIPMT 2001
3

Probability of four sons to a couple is : -

  1. 116
  2. 18
  3. 14
  4. 132
AIPMT 2001
4

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%
AIPMT 2000
5

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
AIPMT 2000
6

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
AIPMT 2000
7

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
AIPMT 2000
8

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
AIPMT 2000

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