Q. No.A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by:
1. Only daughters 2. Only sons 3. Only grandchildren 4. Both sons and daughters
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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 govern 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 | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 4 | 1 | 2 | 3 |
| 3. | 4 | 3 | 1 | 2 |
| 4. | 2 | 1 | 4 | 3 |
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Sickle cell anaemia has not been eliminated from the African population because:
1. It is controlled by recessive genes
2. It is not a fatal disease
3. It provides immunity against malaria
4. It is controlled by dominant genes
Select the incorrect statement:
| 1. | Human males have one of their sex-chromosome much shorter than the other. |
| 2. | Male fruit fly is heterogametic. |
| 3. | In male grasshoppers, 50% of sperms have no sex chromosome. |
| 4. | In domesticated fowls, the sex of progeny depends on the type of sperm rather than the egg. |
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What map unit (Centimorgan) is adopted in the construction of genetic maps?
| 1. | A unit of distance between genes on chromosomes, representing 50% cross-over. |
| 2. | A unit of distance between two expressed genes, representing 10% cross-over. |
| 3. | A unit of distance between two expressed genes, representing 100% cross-over. |
| 4. | A unit of distance between genes on chromosomes. representing 1% cross-over. |
Which of a women's grandparents could not be the source of any of the genes on either of her X-chromosomes?
| 1. | Mother's Father. | 2. | Father's Mother. |
| 3. | Mother's Mother. | 4. | Father's Father. |
The inheritance of colour in wheat Kernel shown below is explained by:
| 1. | Polygenic inheritance | 2. | Pleiotropy |
| 3. | Epistatic interaction | 4. | Multiple allelism |
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Regarding Mendelian disorders :
| 1. | Color blindness is more common in the females of the species. |
| 2. | Sickle cell anemia occurs due to the substitution of valine by glutamic acid in the globin chain of haemoglobin. |
| 3. | Individuals affected by phenylketonuria lack an enzyme that converts tyrosine to phenylalanine. |
| 4. | Thalassemia is inherited as an autosomal recessive trait. |
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Match each item in Column I with one in Column II and select the correct answer from the codes given:
|
A |
Codominance |
P |
Progeny resembles both parents |
|
B |
Incomplete dominance |
Q |
Progeny does not resemble either of the parents |
|
C |
Sex determination in Drosophila |
R |
Haplo-diploidy |
|
D |
Sex determination in Honey bee |
S |
Genic balance |
Codes :
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | P | Q | S | R |
| 3. | Q | P | R | S |
| 4. | Q | P | S | R |
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All genes located on the same chromosome:
| 1. | Form different groups depending upon their relative distance |
| 2. | Form one linkage group |
| 3. | Will not from any linkage groups |
| 4. | Form interactive groups that affect the phenotype |
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