Q. No.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
Pick out the correct statements.
I. Haemophilia is a sex-linked recessive disease
II. Down's syndrome is due to aneuploidy.
III. Phenylketonuria is an autosomal recessive gene disorder
IV. Sickle cell anaemia is an x - linked recessive gene disorder
(1) II and IV are correct
(2) I, III and IV are correct
(3) I, II and III are correct
(4) I and IV are correct
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 |
Which of the following most appropriately describes haemophilia?
(1) X-linked recessive gene disorder
(2) Choromosomal disorder
(3) dominant gene disorder
(4) Recessive gene disorder
In angiosperms, microsporogenesis and megasporogenesis
(1) occur in anther
(2) form gametes without further divisions
(3) involve meiosis
(4) occur in ovule
Destruction of the anterior horn cells of the spinal cord would result in loss of
(1) sensory impulses
(2) voluntary motor impulses
(3) commissural impulses
(4) integrating impulses
The cutting of DNA at specific locations became possible with the discovery of
(1) restriction enzymes
(2) probes
(3) selectable markets
(4) ligases
The enzyme that is not present in succus entericus is
(1) maltase
(2) nucleases
(3) nucleosidase
(4) lipase
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