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Principles of Inheritance and Variation · Question 162

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

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

Answer

(3) Transfer of segments in X and Y chromosomes

Solution

In humans maleness is decided by the testis-determining gene (SRY) present on the Y chromosome.

During meiosis in the father, an abnormal exchange (translocation) of segments between X and Y chromosomes can carry the SRY region to the X chromosome.

⇒ An XX individual receiving such an X develops as a male (XX male).

⇒ An XY individual whose Y has lost this segment develops as a female (XY female).

∴ XX males and XY females arise due to transfer of segments between X and Y chromosomes.

Answer: (3)

AIPMT 2001

Keep practising — Principles of Inheritance and Variation

2

Probability of four sons to a couple is : -

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

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
4

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
5

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
6

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
7

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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