Q. No.Male pattern baldness is a ___________ trait.
1. Sex-linked 2. Sex-limited 3. Sex-influenced 4. Y-linked
A sex aneuploid Drosophila has 2 sets of autosomes and sex chromosome complement XXY. This fly would be:
| 1. | A normal fertile female | 2. | A normal fertile male |
| 3. | An intersex | 4. | A metamale |
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In humans, the condition red-green color blindness is a sex-linked recessive trait. In a family pedigree analysis, you find that two people with normal color vision have a color-blind son. This is possible if the genotypes of the parents are:
| 1. | XcXc and XcY | 2. | XcXc and XCY |
| 3. | XCXC and XcY | 4. | XCXc and XCY |
A woman has four daughters. The chance that her next child will be a son is:
| 1. | 1 | 2. | 0 |
| 3. | \(1 \over 2\) | 4. | \(1 \over 4\) |
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In Drosophila melanogaster cinnabar eye is a sex-linked recessive trait. A female fly having cinnabar eyes is crossed with a wild-type male. The percentage of the male progeny of this cross with cinnabar eyes is expected to be:
| 1. | 0% | 2. | 25% |
| 3. | 50% | 4. | 100% |
Eye color in a fly is inherited via a single gene with seven different alleles. How many different types of gametes would be possible in this system in an individual fly?
1. 2
2. 7
3. 28
4. 56
Nondisjunction of a pair of homologous chromosomes occurs during the anaphase of meiosis I. The four gametes produced as a result of this nondisjunction event will be:
| 1. | n + 1; n + 1; n - 1; n - 1 | 2. | n + 1; n - 1; n; n |
| 3. | n + 1; n - 1; n - 1; n - 1 | 4. | n + 1; n + 1; n; n |
The inheritance of the trait shown in the given pedigree most likely is:
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex-linked recessive | 4. | Sex-linked dominant |
The inheritance of genes finds a parallel with the behavior of chromosomes, especially during cell division for gamete formation. Such parallels include:
| I: | they are both present in pairs in all diploid cells and one of the pairs is present in the gamete |
| II: | they both undergo segregation during meiosis. |
| III: | their copy numbers in the cell decrease after meiosis, and increase during fertilization. |
| IV: | they are both copied during the S phase of the cell cycle. |
| 1. | I, II and III only | 2. | I, II and IV only |
| 3. | II, III and IV only | 4. | I, II, III and IV |
Identify the condition where the following karyotype is expected:
1. Klinefelter’s syndrome
2. Cri du chat syndrome
3. Turner’s syndrome
4. Down’s syndrome
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