Q. No.A test cross is done to find out:
1.
Fitness of an organism
2.
Genotype of a plant expressing dominant phenotype
3.
The suitable parents for a Mendelian Cross
4.
The hidden genotypic ratio of F2 phenotypes
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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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Thalassemia is inherited as a/an ____________ condition.
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex linked recessive | 4. | Sex linked dominant |
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The number of alleles, the genotypic combinations, and phenotypes in the ABO system are respectively:
| 1. | 3, 6 and 4 | 2. | 3, 4 and 6 |
| 3. | 2, 3 and 4 | 4. | 2, 3, and 6 |
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When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. This can be attributed to the fact that:
| 1. | The genes are located on the X and Y chromosomes. |
| 2. | Fruit fly has abnormal chromosomes. |
| 3. | The genes are located on the X chromosome. |
| 4. | The genes exhibit incomplete dominance. |
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Mutations that arise due to changes in a single base pair of DNA are called as:
| 1. | Chromosomal aberrations | 2. | Point mutations |
| 3. | Nonsense mutations | 4. | Frameshift mutations |
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When there is a change in the chromosome number such that the changes number is not an exact multiple of base number [haploid number], the condition is called as:
| 1. | Euploidy | 2. | Aneuploidy |
| 3. | Aberration | 4. | Non-disjunction |
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The expression of only one of the parental characters in a monohybrid cross in the F1, the expression of both in the F2 and the proportion of 3:1 obtained at the F2 can be explained by:
1. Law of Dominance
2. Law of segregation
3. Law of Independent Assortment
4. Two-factor interaction
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