Q. No.A gene showing codominance has
(1) one allele dominant on the other
(2) alleles tightly linked on the same chromosome
(3) alleles that are recessive to each other
(4) both alleles independently expressed in the heterozygote
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?
(1) Five
(2) Six
(3) Eight
(4) Seven
Which one from those given below is the period of Mendel's hybridisation experiments?
(1) 1856 - 1863
(2) 1840 - 1850
(3) 1857 - 1869
(4) 1870 - 1877
Among the following characters, which one was not considered by Mendel in his experiments on pea?
(1) Stem - Tall or Dwarf
(2) Trichomes - Glandular or Non-glandular
(3) Seed - Green or Yellow
(4) Pod - Inflated or Constricted
A disease caused by an autosomal primary non-disjunction is
(1) Down's syndrone
(2) Kilnerfelter's syndrome
(3) Turner's syndrome
(4) Sickle-cell anemia
The mechanism that causes a gene to move from one linkage group to another is called
(1) inversion
(2) duplication
(3) translocation
(4) crossing-over
If a colourblind man marries a woman who is homozygous for normal colour vision, the probalility of their son being colourblind is
(1) 0
(2) 0.5
(3) 0.75
(4) 1
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 the ratio of
(1) 1 : 2 : 1 :: Tall heterozygous : tall homozygous : Dwarf
(2) 3 : 1 :: Tall : Dwarf
(3) 3 : 1 :: Dwarf : Tall
(4) 1 : 2 : 1 :: Tall homozygous : Tall heterogygous : Dwarf
In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates
(1) chromosomes failed to separate during meiosis
(2) the two genes are linked and present on the same chromosome
(3) both of the characters are controlled by more than one gene
(4) the two genes are located on two different chromosomes
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 govern a single character |
|
B. Codominance |
2. Ina 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 |
Codes :
|
|
A |
B |
C |
D |
|
(1) |
2 |
3 |
4 |
1 |
|
(2) |
4 |
1 |
2 |
3 |
|
(3) |
4 |
3 |
1 |
2 |
|
(4) |
2 |
1 |
4 |
3 |
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