Q. No.If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:
1. Autosomal dominant 2. Autosomal recessive 3. Sex-linked dominant 4. Sex-linked recessive
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In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
1. G GG
2. A A G
3. G A A
4. G U G
Person having genotype IA IB would show the blood group as AB. This is because of:
1. Pleiotropy
2. Co-dominance
3. Segregation
4. Incomplete dominance
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A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
| 1. | TT and Tt | 2. | Tt and Tt |
| 3. | TT and TT | 4. | Tt and tt |
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In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
1. The alleles of two genes are interacting with each other
2. It is a multigenic inheritance
3. It is a case of multiple allelism
4. The alleles of two genes are segregating independently
Which of the following will not result in variations among siblings?
1. Independent assortment of genes
2. Crossing over
3. Linkage
4. Mutation
Mendel’s Law of independent assortment holds good for genes situated on the:
1. non-homologous chromosomes
2. homologous chromosomes
3. extra nuclear genetic element
4. same chromosome
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Occasionally, a single gene may express more than one effect. The phenomenon is called:
| 1. | multiple allelism | 2. | mosaicism |
| 3. | pleiotropy | 4. | polygeny |
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In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
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