Q. No.A certain gene has 5 alleles. What will be the number of possible genotypic combinations?
1. 5
2. 15
3. 32
4. 2
2. 15
3. 32
4. 2
How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
| 1. | 4 | 2. | 8 |
| 3. | 16 | 4. | 32 |
The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:
| 1. | it revealed new and unanticipated features of Mendel’s pea plant varieties. |
| 2. | it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. |
| 3. | it allowed scientists to see the DNA present within chromosomes. |
| 4. | it led to the discovery of mitochondria. |
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An abnormal human of the karyotype 49, XXXYY will form how many Barr bodies?
1. 1
2. 2
3. 3
4. 4
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
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