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 Multiple Choice QuestionsMultiple Choice Questions

1.

Assertion: A middle aged woman is reported to have small breasts and undersized uterus.

Reason: Her genotypic analysis shows XO condition of allosomes.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false


2.

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in ratio of 

  • 1:2:1 :: Tall heterozygous: Tall homozygous: Dwarf

  • 3:1:: Tall: Dwarf

  •  3:1:: Dwarf: Tall

  •  3:1:: Dwarf: Tall

1498 Views

3.

Pick out the correct statement.

I. Haemophilia is a sex-linked recessive disease
II. Down's syndrn=me is due to aneuploidy
III. Phenylketonuria is an autosomal recessive gene disorderIv. Sickle cell anaemia is an X-linked recessive gene disorder

  • II and IV are correct

  • I, III and IV are correct

  • I, II and III are correct

  • I, II and III are correct

976 Views

4.

In a test cross involving F1 dihybrid flies, more parental-type offspring were produced that the recombinant type offspring. This indicates

  • chromosomes failed to separate during meiosis

  • the two genes are linked and present on the same chromosome

  • both of the characters are controlled by more than one gene

  • both of the characters are controlled by more than one gene

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5.

Match the terms in Column I with their description in Column II and choose the correct option. 


Column I Column II
A. Dominance   1. Many genes governs a single character
B. Codominance  2. In a heterozygous organism, only one allele expresses itself
C. Pleiotropy 3.  In a heterozygous organism both alleles express themselves fully
D. Polygenic inheritance 4. A single gene influences many characters
  • A B C D
    2 3 4 1
  • A B C D
    4 1 2 3
  •  A
     4  1
  •  A
     4  1
814 Views

6.

Which of the following most appropriately describes haemophilia?

  • X-linked recessive gene disorder
  • Chromosomal disorder

  • Dominant gene disorder

  • Dominant gene disorder

987 Views

7.

Which of the following statements is not true for cancer cells in relation to mutations?

  • Mutations destroy telomerase inhibitor

  • Mutations inactivate the cell control

  • Mutations inhibit production of telomerase

  • Mutations inhibit production of telomerase

1826 Views

8.

Which of the following statements is not true of two genes that show 50% recombination frequency?

  • the genes may be on different chromosomes

  • the genes are tightly linked

  • the genes show independent assortment

  • the genes show independent assortment

1132 Views

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9.

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as

  • genetic flow

  • genetic drift

  • random mating

  • random mating

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10.

If two persons with 'AB' blood group marry and have sufficiently a large number of children, these children could be classified as 'A' blood group in 1:2:1 ratio. The modern technique of protein electrophoresis reveals the presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of 

  • codominance

  • incomplete dominance

  • partial dominance

  • partial dominance

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