Q. No.All the following are mechanisms of sex determination in living organisms except:
1. The Z-W system
2. The X-O system
3. The haplo-diploid system
4. The parthenogenetic system
1. The Z-W system
2. The X-O system
3. The haplo-diploid system
4. The parthenogenetic system
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A recessive pattern of inheritance can be easily identified in a pedigree analysis if it shows that:
| 1. | Two affected individuals have three affected children. |
| 2. | Two unaffected individuals have one affected and two unaffected children. |
| 3. | There are four instances where at least one affected parent has an affected child. |
| 4. | Two known heterozygotes have two affected and one unaffected child. |
Pedigree analysis rather than conventional methods are used to study genetic traits because:
| I: | Number of progeny is limited |
| II: | Choice matings are not possible |
| III: | Sexual dimorphism is seen in humans |
1. I only
2. II only
3. III only
4. Both I and II
A true breeding (pure line) plant can be differentiated from a hybrid as:
1. They only have one type of allele of the gene that controls the trait of interest.
2. They carry two different alleles for the gene that controls the trait of interest.
3. They can only reproduce by self fertilization.
4. They all have dominant alleles for the trait of interest.
Match the disorder in Column I with the location of the gene causing it in Column II and select the correct option from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A. |
Sickle cell anaemia |
a. |
Chromosome 11 |
|
B. |
Phenylketonuria |
b. |
Chromosome 12 |
|
C. |
Cystic fibrosis |
c. |
Chromosome 7 |
|
D. |
Huntington’s disease |
d. |
Chromosome 4 |
Codes:
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | b | a | c | d |
| 3. | a | b | d | c |
| 4. | b | a | d | c |
The pedigree shows the inheritance of red-green color blindness in a family. If II 3 marries a color-blind man, what is the probability that her first child will be normal?
| 1. | ¼ | 2. | ½ |
| 3. | 2/3 | 4. | ¾ |
The blood groups possible in progeny of a type A mother and a type AB father can be
1. A, B, AB, and O
2. A, B, and AB
3. A and AB
4. A only
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The pedigree shown below cannot be:
| I. | Autosomal dominant disorder |
| II. | Autosomal recessive disorder |
| III. | Sex-linked dominant disorder |
| IV. | Sex-linked recessive disorder |
| V. | Holandric disorder |
| 1. | I, II, and III only | 2. | I, II, III, and V only |
| 3. | I, III, IV, and V only | 4. | I, II, III, IV and V |
The recombination frequencies for four different linked genes of Drosophila are shown in the figure:
The order of the four genes will be:
| 1. | rb-cn-vg-b | 2. | vg-b-rb-cn |
| 3. | cn-rb-b-vg | 4. | b-rb-cn-vg |
In a fruit fly, the eye colour trait is located on X-chromosome and the vestigial wing trait is located on an autosome. What is the possibility that a cross between a white-eyed male fruit fly with vestigial wings and a wild-type female who is heterozygous for both traits will result in a female offspring with vestigial wings and white eyes?
| 1. | 1/16 | 2. | 1/8 |
| 3. | ¼ | 4. | ½ |
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