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Principles of Inheritance and Variation

AIPMT 2000MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 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%

Answer

(1) 50%

Solution

Consider each gene separately (independent assortment).

Height: TT tt ⇒ all Tt ⇒ tall = 1

Flower colour: Rr rr ⇒ 12 Rr (red) : 12 rr (white) ⇒ red = 12

∴ Tall, red-flowered plants = 1 12 = 12 = 50\%

Answer: (1)

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Ques. 2AIPMT 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. 3AIPMT 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. 4AIPMT 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. 5AIPMT 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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