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% |
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 |
Identify the chromosomal aberration:
| 1. | Inversion | 2. | Reciprocal translocation |
| 3. | Deletion | 4. | Duplication |
A couple comes to you for genetic counselling. Both have a sister affected with albinism but all other members are normal. Your advice regarding the risk of their child being affected with albinism would be:
| 1. | They must both be heterozygotes so their risk of having an affected child is ¼. |
| 2. | They might both be heterozygotes so they should get tested to see if they carry the disease allele or not. |
| 3. | Since neither one of them is affected, they are not at risk of having an affected child. |
| 4. | You can't give them any firm answers because you don't know their genotypes. |
Linkage maps:
| 1. | always have a total of 100 map units. |
| 2. | can be used to pinpoint the precise physical position of a gene on a chromosome. |
| 3. | are a genetic map based on recombination frequencies. |
| 4. | reflect the frequency of crossing over between X and Y chromosomes. |
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A true breeding red striped tree frog is crossed with a true breeding plain green frog. All progeny have red stripes. This is because:
| 1. | Stripes are dominant to plain green coloration. |
| 2. | Striped frogs are camouflaged better. |
| 3. | Plain green frogs are easily predated upon. |
| 4. | Striped frogs are more common. |
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